Push error when query has no results #4496

Issue Description

Anytime I send a push and the push query doesn't map to any users, Parse dashboard reports that push as an error and the logs also report an error. This leads me to believe that many of my pushes are not being sent. Shouldn't these pushes be reported as success even though they are not sent to a single user?

Steps to reproduce

Send push with a push query that includes no users.

Expected Results

No pushes are sent and no push errors are reported.

Actual Outcome

The following push error is reported and parse dashboard shows push status as failed

"errorMessage": {
2018-01-13T07:06:55.983637+00:00 app[web.1]:           "error": "PushController: no results in query"
2018-01-13T07:06:55.983638+00:00 app[web.1]:         
}

Environment Setup

• Server

  • parse-server version : 2.7.1
  • Operating System: N/A
  • Hardware: N/A
  • Localhost or remote server? Heroku (2X web, 2X worker)

• Database

  • MongoDB version: 3.2.1
  • Storage engine: N/A
  • Hardware: N/A
  • Localhost or remote server? mLab

Logs/Trace

"errorMessage": {
2018-01-13T07:06:55.983637+00:00 app[web.1]:           "error": "PushController: no results in query"
2018-01-13T07:06:55.983638+00:00 app[web.1]:        
 }