fix(error): don't re-raise for handled exceptions (#44)

cirrus/google_cloud/manager.py

@@ -1191,7 +1191,7 @@ def remove_member_from_group(self, member_email, group_id):
                     "Group ({}) members were checked and {} was "
                     "successfully removed".format(group_id, member_email)
                 )
-                response = {}
+                return {}
             raise
 
         return response