Previously, in gr-account-label, an undefined name field resulted in a
completely empty tag. This is because, in general, the name field is
autopopulated by gerrit. However, there are some cases (like with
certain buildbots) where the name field was undefined. Now, in this
case, the email is still displayed.
Bug: Issue 4617
Change-Id: I91c54a8823b20b04dbed2a86b2b987ac34a0f0f9