Bug#992308: freecad: addon manager locks up on "Install/update selected"

[Yorik van Havre]

A workaround [1] has been added upstream so the addon manager switches 
back to no-git/HTML download in case the "git" module has no "Repo" 
attribute and FreeCAD continues gracefully, so this bug can be 
considered as fixed upstream, but this seems like a weird error anyway 
and indeed probably something wrong with the git module rather than 
FreeCAD...

[1] https://tracker.freecadweb.org/view.php?id=4072#c15827