Update routing.py

Fix index out of range unandled exception when request.postpath is an empty list

corepost/routing.py

@@ -212,7 +212,7 @@ class RequestRouter:
                 self.__filterRequests(request)
 
             # standardize URL and remove trailing "/" if necessary
-            standardized_postpath = request.postpath if (request.postpath[-1] != '' or request.postpath == ['']) else request.postpath[:-1]
+            standardized_postpath = request.postpath if (len(request.postpath)==0 or request.postpath[-1] != '' or request.postpath == ['']) else request.postpath[:-1]
             path = '/'.join(standardized_postpath) 
 
             contentType =  MediaType.WILDCARD if HttpHeader.CONTENT_TYPE not in request.received_headers else request.received_headers[HttpHeader.CONTENT_TYPE]       
@@ -428,4 +428,4 @@ class RequestRouter:
     def __filterResponses(self,request,response):
         """Filters incoming requests"""
         for webFilter in self.__responseFilters:
-            webFilter.filterResponse(request,response)            
\ No newline at end of file
+            webFilter.filterResponse(request,response)