message: fix(query_range): invalid memory address or nil pointer dereference
diff: @@ -1159,6 +1159,7 @@ func (aH *APIHandler) queryRangeMetrics(w http.ResponseWriter, r *http.Request)
  RespondError(w, &model.ApiError{model.ErrorTimeout, res.Err}, nil)
  }
  RespondError(w, &model.ApiError{model.ErrorExec, res.Err}, nil)
  + return
  }
  response_data := &model.QueryData{
  