When no review is posted yet, Gerrit returns simplified 'labels'
data. In particular it's missing the ['labels']['Code-Review]['all']
dictionary, which we assumed would always be present.
We should only add approvers from the reviews if the 'all' key is
provided, and otherwise just work from the owner email.
Remove all changes pushed to investigate the issue: use a narrow
query again (rather than the /detail call) and no longer catch the
exception.
Change-Id: I13fa07754e38281c63dcf0eceaa4c3b3c2715618
2ce6a551ac