Don't use the dispatch action if the request is a forward or include. Fixes #10231

Author: graemerocher

grails-web-url-mappings/src/main/groovy/org/grails/web/mapping/DefaultUrlMappingInfo.java

@@ -242,7 +242,9 @@ public String getId() {
     }
 
     private String checkDispatchAction(HttpServletRequest request) {
-        if (request.getAttribute(WebUtils.EXCEPTION_ATTRIBUTE) != null) return null;
+        if (request.getAttribute(WebUtils.EXCEPTION_ATTRIBUTE) != null || WebUtils.isForwardOrInclude(request)) {
+            return null;
+        }
 
         String dispatchActionName = null;
         Enumeration<String> paramNames = tryMultipartParams(request, request.getParameterNames());