Control the case when sources emit results with remaining=0 more than once for the same operation (which is wrong). If this is detected drop a warning message and avoid crashing.
Control the case when sources emit results with remaining=0
more than once for the same operation (which is wrong). If this is
detected drop a warning message and avoid crashing.

kyoushuu/grilo,GNOME/grilo,GNOME/grilo,jasuarez/grilo,jasuarez/grilo,grilofw/grilo,jasuarez/grilo,MathieuDuponchelle/grilo,grilofw/grilo,MathieuDuponchelle/grilo,kyoushuu/grilo,MathieuDuponchelle/grilo,kyoushuu/grilo,grilofw/grilo,kyoushuu/grilo