Bug 1789398 - ensure task["metadata"]["owner"] is not empty on github-push decision tasks
Bug 1789398 - ensure task["metadata"]["owner"] is not empty on github-push decision tasks

Treeherder requires this in its ingestion pipeline, so if the pusher
doesn't have an email then use their name instead.

mozilla-mobile/focus-android,mozilla-mobile/focus-android,mozilla-mobile/focus-android,mozilla-mobile/focus-android,mozilla-mobile/focus-android,mozilla-mobile/focus-android