Add a null handler to the root logger to silence test errors

app.py

@@ -104,8 +104,13 @@ class InjectingFilter(logging.Filter):
       record.msg = '[%s] %s' % (request.request_id, record.msg)
     return True
 
+root_logger = logging.getLogger()
+
+# Add a null handler to the root logger to silence missing handler errors in tests
+root_logger.addHandler(logging.NullHandler())
+
 # Add the request id filter to all handlers of the root logger
-for handler in logging.getLogger().handlers:
+for handler in root_logger.handlers:
   handler.addFilter(InjectingFilter())
 
 app.request_class = RequestWithId