cubicweb-dataio #3479800 Errors should not be silent in yeq [validation pending]

We should only catch the UnsupportedVocabulary exception.

prioritynormal
typebug
done in0.4.0
load0.100
load left0.000
closed by#44056f39bff5 [xy] Don't catch any exception, closes #3479800
patchdon't catch any exception [applied]