spring boot v2.2.6 RELEASE 项目里报错

包含的依赖 SpringBoot v2.2.6 RELEASE
报错日志：

```
FreeMarker template error:
The following has evaluated to null or missing:
==> paramNode.type  [in template "api-request-node.html.ftl" at line 41, column 31]

----
Tip: It's the step after the last dot that caused this error, not those before it.
----
Tip: If the failing expression is known to legally refer to something that's sometimes null or missing, either specify a default value like myOptionalVar!myDefault, or use <#if myOptionalVar??>when-present<#else>when-missing</#if>. (These only cover the last step of the expression; to cover the whole expression, use parenthesis: (myOptionalVar.foo)!myDefault, (myOptionalVar.foo)??
----

----
FTL stack trace ("~" means nesting-related):
	- Failed at: ${paramNode.type}  [in template "api-request-node.html.ftl" at line 41, column 29]
	- Reached through: #include "api-request-node.html.ftl"  [in template "api-controller.html.ftl" at line 70, column 29]
----

Java stack trace (for programmers):
----
freemarker.core.InvalidReferenceException: [... Exception message was already printed; see it above ...]
	at freemarker.core.InvalidReferenceException.getInstance(InvalidReferenceException.java:134)
	at freemarker.core.EvalUtil.coerceModelToTextualCommon(EvalUtil.java:481)
	at freemarker.core.EvalUtil.coerceModelToStringOrMarkup(EvalUtil.java:401)
	at freemarker.core.EvalUtil.coerceModelToStringOrMarkup(EvalUtil.java:370)
	at freemarker.core.DollarVariable.calculateInterpolatedStringOrMarkup(DollarVariable.java:100)
	at freemarker.core.DollarVariable.accept(DollarVariable.java:63)
	at freemarker.core.Environment.visit(Environment.java:334)
	at freemarker.core.Environment.visit(Environment.java:376)
	at freemarker.core.IteratorBlock$IterationContext.executedNestedContentForCollOrSeqListing(IteratorBlock.java:321)
	at freemarker.core.IteratorBlock$IterationContext.executeNestedContent(IteratorBlock.java:271)
	at freemarker.core.IteratorBlock$IterationContext.accept(IteratorBlock.java:244)
	at freemarker.core.Environment.visitIteratorBlock(Environment.java:644)
	at freemarker.core.IteratorBlock.acceptWithResult(IteratorBlock.java:108)
	at freemarker.core.IteratorBlock.accept(IteratorBlock.java:94)
	at freemarker.core.Environment.visit(Environment.java:334)
	at freemarker.core.Environment.visit(Environment.java:340)
	at freemarker.core.Environment.visit(Environment.java:340)
	at freemarker.core.Environment.visit(Environment.java:340)
	at freemarker.core.Environment.include(Environment.java:2925)
	at freemarker.core.Include.accept(Include.java:171)
	at freemarker.core.Environment.visit(Environment.java:334)
	at freemarker.core.Environment.visit(Environment.java:376)
	at freemarker.core.IteratorBlock$IterationContext.executedNestedContentForCollOrSeqListing(IteratorBlock.java:321)
	at freemarker.core.IteratorBlock$IterationContext.executeNestedContent(IteratorBlock.java:271)
	at freemarker.core.IteratorBlock$IterationContext.accept(IteratorBlock.java:244)
	at freemarker.core.Environment.visitIteratorBlock(Environment.java:644)
	at freemarker.core.IteratorBlock.acceptWithResult(IteratorBlock.java:108)
	at freemarker.core.IteratorBlock.accept(IteratorBlock.java:94)
	at freemarker.core.Environment.visit(Environment.java:334)
	at freemarker.core.Environment.visit(Environment.java:340)
	at freemarker.core.Environment.process(Environment.java:313)
	at freemarker.template.Template.process(Template.java:383)
	at io.github.yedaxia.apidocs.doc.HtmlControllerDocBuilder.buildDoc(HtmlControllerDocBuilder.java:53)
	at io.github.yedaxia.apidocs.doc.AbsDocGenerator.generateControllersDocs(AbsDocGenerator.java:66)
	at io.github.yedaxia.apidocs.doc.AbsDocGenerator.generateDocs(AbsDocGenerator.java:35)
	at io.github.yedaxia.apidocs.Docs.buildHtmlDocs(Docs.java:30)
```
虽然报错，但是文档是生成了，生成的文档显示有问题。
以下是生成的文档参数一栏显示的错误信息：

```
FreeMarker template error (DEBUG mode; use RETHROW in production!): The following has evaluated to null or missing: ==> paramNode.type [in template "api-request-node.html.ftl" at line 41, column 31] ---- Tip: It's the step after the last dot that caused this error, not those before it. ---- Tip: If the failing expression is known to legally refer to something that's sometimes null or missing, either specify a default value like myOptionalVar!myDefault, or use <#if myOptionalVar??>when-present<#else>when-missing. (These only cover the last step of the expression; to cover the whole expression, use parenthesis: (myOptionalVar.foo)!myDefault, (myOptionalVar.foo)?? ---- ---- FTL stack trace ("~" means nesting-related): - Failed at: ${paramNode.type} [in template "api-request-node.html.ftl" at line 41, column 29] - Reached through: #include "api-request-node.html.ftl" [in template "api-controller.html.ftl" at line 70, column 29] ---- Java stack trace (for programmers): ---- freemarker.core.InvalidReferenceException: [... Exception message was already printed; see it above ...] at freemarker.core.InvalidReferenceException.getInstance(InvalidReferenceException.java:134) at freemarker.core.EvalUtil.coerceModelToTextualCommon(EvalUtil.java:481) at freemarker.core.EvalUtil.coerceModelToStringOrMarkup(EvalUtil.java:401) at freemarker.core.EvalUtil.coerceModelToStringOrMarkup(EvalUtil.java:370) at freemarker.core.DollarVariable.calculateInterpolatedStringOrMarkup(DollarVariable.java:100) at freemarker.core.DollarVariable.accept(DollarVariable.java:63) at freemarker.core.Environment.visit(Environment.java:334) at freemarker.core.Environment.visit(Environment.java:376) at freemarker.core.IteratorBlock$IterationContext.executedNestedContentForCollOrSeqListing(IteratorBlock.java:321) at freemarker.core.IteratorBlock$IterationContext.executeNestedContent(IteratorBlock.java:271) at freemarker.core.IteratorBlock$IterationContext.accept(IteratorBlock.java:244) at freemarker.core.Environment.visitIteratorBlock(Environment.java:644) at freemarker.core.IteratorBlock.acceptWithResult(IteratorBlock.java:108) at freemarker.core.IteratorBlock.accept(IteratorBlock.java:94) at freemarker.core.Environment.visit(Environment.java:334) at freemarker.core.Environment.visit(Environment.java:340) at freemarker.core.Environment.visit(Environment.java:340) at freemarker.core.Environment.visit(Environment.java:340) at freemarker.core.Environment.include(Environment.java:2925) at freemarker.core.Include.accept(Include.java:171) at freemarker.core.Environment.visit(Environment.java:334) at freemarker.core.Environment.visit(Environment.java:376) at freemarker.core.IteratorBlock$IterationContext.executedNestedContentForCollOrSeqListing(IteratorBlock.java:321) at freemarker.core.IteratorBlock$IterationContext.executeNestedContent(IteratorBlock.java:271) at freemarker.core.IteratorBlock$IterationContext.accept(IteratorBlock.java:244) at freemarker.core.Environment.visitIteratorBlock(Environment.java:644) at freemarker.core.IteratorBlock.acceptWithResult(IteratorBlock.java:108) at freemarker.core.IteratorBlock.accept(IteratorBlock.java:94) at freemarker.core.Environment.visit(Environment.java:334) at freemarker.core.Environment.visit(Environment.java:340) at freemarker.core.Environment.process(Environment.java:313) at freemarker.template.Template.process(Template.java:383) at io.github.yedaxia.apidocs.doc.HtmlControllerDocBuilder.buildDoc(HtmlControllerDocBuilder.java:53) at io.github.yedaxia.apidocs.doc.AbsDocGenerator.generateControllersDocs(AbsDocGenerator.java:66) at io.github.yedaxia.apidocs.doc.AbsDocGenerator.generateDocs(AbsDocGenerator.java:35) at io.github.yedaxia.apidocs.Docs.buildHtmlDocs(Docs.java:30) at 
```

叶大侠/JApiDocs

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叶大侠/JApiDocs .gitee-modal { width: 500px !important; }

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