GUACAMOLE-598: Abort rendering of pages if critical data fails to load (data without which the page is non-functional).

guacamole/src/main/webapp/app/groupList/directives/guacGroupList.js

@@ -222,7 +222,7 @@ angular.module('groupList').directive('guacGroupList', [function guacGroupList()
                             });
                         });
 
-                    }, requestService.WARN);
+                    }, requestService.DIE);
 
                 }