heroku/heroku — pull request #967 by catsby (2013-12-11 15:55:51+00:00)
Title: Handle a nil transfer better

Sometimes `pgbackup_client.get_transfer(transfer['id'])` ends up nil, so this
commit will handle that more gracefully. Don't try to update the display with a
nil transfer, instead, just let things loop again

Fixes https://github.com/heroku/heroku/issues/896