bug#33328: 27.0.50; Extend Emacs bug report

[Eli Zaretskii]

> From: Michael Albinus <michael.albinus@gmx.de>
> Date: Fri, 09 Nov 2018 23:19:30 +0100
> 
> Working on Emacs branches, I'd like to see branch information in the bug
> report. It could look like in this report, see the "Repository branch"
> line. The respective patch is appended.
> 
> Is it OK to push to master?

You pushed ignoring-errors to the functions that return the revision
and the branch, and I wonder whether that is a good idea.  Those
functions are useful on their own right, and their doc strings say
nothing about the situation where something goes wrong with the Git
invocation or any other calamities.

Thanks.