[DRE-maint] Bug#1019731: gitlab: failed to fetch comments in merge requests (500 Internal Server Error)

[Maximilian Stein]

 > My bad, I mixed things up: the 500 error I am experiencing is the one 
from https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1019403 
(undefined method `h' for LabelsHelper:Module).


Yeah, these two seem quite similar. The workaround for 1019403 has to be 
repeated after every update, though, while this one only needs to be 
implemented once.