2.4版本在线生成主附表生成有误

##### 版本号：2.4

##### 问题描述：
Online表单开发 点击商城订单表 代码生成 无法生成相关子类信息 以及 对应vue前端页面 页面错误
        // 新增时子表默认添加几行空数据
        addDefaultRowNum: 1,
        validatorRules: {
          orderCode: {
            initialValue:"${shop_order_num}",
            rules: [
            ]
          },
        },
        refKeys: [],
        tableKeys:[],
        activeKey: 'FreeMarker template error (DEBUG mode; use RETHROW in production!):
The following has evaluated to null or missing:
==> subTables[0]  [in template "default\\onetomany\\java\\${bussiPackage}\\${entityPackage}\\vue\\modules\\${entityName}Form.vuei" at line 296, column 23]

----
Tip: It's the final [] step 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: ${subTables[0].entityName?uncap_first}  [in template "default\\onetomany\\java\\${bussiPackage}\\${entityPackage}\\vue\\modules\\${entityName}Form.vuei" at line 296, column 21]
----

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.UnexpectedTypeException.newDescriptionBuilder(UnexpectedTypeException.java:85)
	at freemarker.core.UnexpectedTypeException.<init>(UnexpectedTypeException.java:48)
	at freemarker.core.NonHashException.<init>(NonHashException.java:49)
	at freemarker.core.Dot._eval(Dot.java:48)
	at freemarker.core.Expression.eval(Expression.java:101)
	at freemarker.core.Expression.evalAndCoerceToStringOrUnsupportedMarkup(Expression.java:139)
	at freemarker.core.BuiltInForString.getTargetString(BuiltInForString.java:34)
	at freemarker.core.BuiltInForString._eval(BuiltInForString.java:29)
	at freemarker.core.Expression.eval(Expression.java:101)
	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:340)
	at freemarker.core.Environment.process(Environment.java:313)
	at freemarker.template.Template.process(Template.java:383)
	at org.jeecgframework.codegenerate.generate.util.b.a(FreemarkerHelper.java:94)
	at org.jeecgframework.codegenerate.generate.impl.a.a.a(BaseCodeGenerate.java:111)
	at org.jeecgframework.codegenerate.generate.impl.a.a.a(BaseCodeGenerate.java:82)
	at org.jeecgframework.codegenerate.generate.impl.a.a.a(BaseCodeGenerate.java:57)
	at org.jeecgframework.codegenerate.generate.impl.a.a.a(BaseCodeGenerate.java:43)
	at org.jeecgframework.codegenerate.generate.impl.CodeGenerateOneToMany.generateCodeFile(CodeGenerateOneToMany.java:181)
	at org.jeecgframework.codegenerate.generate.impl.CodeGenerateOneToMany.generateCodeFile(CodeGenerateOneToMany.java:196)
	at org.jeecg.modules.online.cgform.service.impl.d.generateOneToMany(OnlCgformHeadServiceImpl.java:1371)
	at org.jeecg.modules.online.cgform.service.impl.d$$FastClassBySpringCGLIB$$a1d6ff6b.invoke(<generated>)
##### 问题截图：

![输入图片说明](https://images.gitee.com/uploads/images/2020/1218/190207_c1e066dc_13974.png "屏幕截图.png")
![输入图片说明](https://images.gitee.com/uploads/images/2020/1218/190250_90eb683f_13974.png "屏幕截图.png")
![输入图片说明](https://images.gitee.com/uploads/images/2020/1218/190338_8881a522_13974.png "屏幕截图.png")
友情提示： 未按格式要求发帖，会直接删掉。

JEECG/JeecgBoot

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JEECG/JeecgBoot .gitee-modal { width: 500px !important; }

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