控制器映射处理.

https://github.com/baomidou/mybatis-plus/issues/2621

mybatis-plus-generator/src/main/resources/templates/controller.java.ftl

@@ -25,7 +25,7 @@ import ${superControllerClassPackage};
 <#else>
 @Controller
 </#if>
-@RequestMapping("<#if package.ModuleName??>/${package.ModuleName}</#if>/<#if controllerMappingHyphenStyle??>${controllerMappingHyphen}<#else>${table.entityPath}</#if>")
+@RequestMapping("<#if package.ModuleName?? && package.ModuleName != "">/${package.ModuleName}</#if>/<#if controllerMappingHyphenStyle??>${controllerMappingHyphen}<#else>${table.entityPath}</#if>")
 <#if kotlin>
 class ${table.controllerName}<#if superControllerClass??> : ${superControllerClass}()</#if>
 <#else>