Progress message of Approval request failure is over detailed

[hsong-rh]

Following is the current progress message when approval request is failed to create:

{
"received_at":string"2021-02-01T18:17:14Z"
"level":string"error"
"message":string"Error while creating approval request: Error message: the server returns an error HTTP status code: 400 Response headers: {"Content-Type"=>"application/json; charset=utf-8", "Cache-Control"=>"no-cache", "X-Request-Id"=>"f46c4d46-0a53-4545-8b34-e166a6e420ef", "X-Runtime"=>"0.025521", "Vary"=>"Origin", "Transfer-Encoding"=>"chunked"} Response body: {"errors":[{"status":"400","detail":"Exceptions::UserError: Workflow bill-2 has no approver group"}]}"
}