Only send an e-mail notification to the change author / committer if
the author / committer is a registered user in Gerrit. Gerrit users
that have the Forge Author / Forge Committer access right are able to
push changes that have an author / committer that is not registered
in Gerrit.
The current code may run into an NPE when there is a change with a
non-registered author / committer, because for such a user the
Account.Id is null which is not handled (e.g. an NPE occurs when
pushing a change with an non-registered author / committer to
refs/draft/).
Change-Id: Id32839d93bd0aff35e25557ffbea9157a63a7b09
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>
0a24796a21