Don't try to smart find packages that aren't there.

We help out by looking for the obvious stuff. But sometimee, like in
git-review, we don't have a package at all.

Change-Id: Ic575c0008c69ffaba43a637b460899dd848d3fd5
Reviewed-on: https://review.openstack.org/26289
Reviewed-by: James E. Blair <corvus@inaugust.com>
Approved: Clark Boylan <clark.boylan@gmail.com>
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Tested-by: Jenkins