Eliminate all of the exceptions when running the tests.

endpoints/api/__init__.py

@@ -210,7 +210,10 @@ def validate_json_request(schema_name):
 
 def request_error(exception=None, **kwargs):
   data = kwargs.copy()
-  raise InvalidRequest(exception.message, data)
+  message = 'Request error.'
+  if exception:
+    message = exception.message
+  raise InvalidRequest(message, data)
 
 
 def log_action(kind, user_or_orgname, metadata={}, repo=None):