cubicweb #1908664 [i18n] crash on i18ncube/i18ninstance [resolved]

when one's cube uses a python module whose __file__ is None (admitedly odd but ...)

prioritynormal
typebug
done in3.13.5
load0.100
load left0.000
closed by#df91baa5b837 [devctl] do not crash in the (rare, odd) case where mod.__file__ is None (closes #1908664)