celery test cleanup

* Alter config so an error will be raised if you forget to mock out a
  celery call in one of your tests
* Remove an unneeded exception type that was masking errors

app/v2/errors.py

@@ -5,7 +5,6 @@ from sqlalchemy.exc import DataError
 from sqlalchemy.orm.exc import NoResultFound
 from app.authentication.auth import AuthError
 from app.errors import InvalidRequest
-from app.notifications import SendNotificationToQueueError
 
 
 class TooManyRequestsError(InvalidRequest):
@@ -61,13 +60,6 @@ def register_errors(blueprint):
     def auth_error(error):
         return jsonify(error.to_dict_v2()), error.code
 
-    @blueprint.errorhandler(SendNotificationToQueueError)
-    def failed_to_create_notification(error):
-        current_app.logger.exception(error)
-        return jsonify(
-            status_code=500,
-            errors=[{"error": error.__class__.__name__, "message": error.message}]), 500
-
     @blueprint.errorhandler(Exception)
     def internal_server_error(error):
         current_app.logger.exception(error)