Project events API not consistent with page & per_page parameters

Created by: jargnar

The GET /projects/:id/events API doesn't work when it is invoked like the following, http://localhost/api/v3/projects/2/events?page=1&per_page=20 when there are less than 20 events. I get a 200 OK but an empty json response. However it returns a good response when there are more than 20 events.