simplify logic

Author: jshum2479

core/src/main/python/wlsdeploy/tool/discover/domain_info_discoverer.py

@@ -167,7 +167,5 @@ def get_roles(self):
                         # put it in the model
                         model[role_name] = dict()
                         model[role_name][model_constants.EXPRESSION] =  role_expression
-            return model_folder, model
-        else:
-            return model_folder, model
+        return model_folder, model