message: sst start: add trace to Python error reporting
  This prevents crashing the live dev lambda handler.
diff: @@ -85,6 +85,7 @@ if __name__ == '__main__':
  result = {
  "errorType": ex_type.__name__,
  "errorMessage": str(ex_value),
  + "trace": traceback.format_tb(ex_traceback),
  }
  # send response
  