Set default view to Page

If a view cannot be found in the `/Common/Templates/` directory, then default to `Page`.

Author: JeremyCaney

Ignia.Topics.Web/WebFormsTopicRoutingService.cs

@@ -231,7 +231,7 @@ public string View {
         /*----------------------------------------------------------------------------------------------------------------------
         | Set view, and return
         \---------------------------------------------------------------------------------------------------------------------*/
-        _view = viewName;
+        _view = viewName?? "Page";
         return _view;
 
       }