Boris Feld <boris.feld@octobus.net> [Thu, 19 Oct 2017 21:50:14 +0200] rev 34910
exchange: propagate the subfunctions return
The parts generator can return a callback to handle server reply. We should
propagate the return for correctness.
log: add an assertion about fctx not being None in patch.diff()
As noted in the comment, this should not happen as removed files (the cause of
fctx2 being None) are caught earlier.