cubicweb-worker #2282872 Too wide except [resolved]

Worker code contains far too wide except:

try:
    …
except Exception, exc:
    …

This silence a lot of useful except (in particular during dev)

priorityminor
typebug
done in1.1.0
load left0.000
closed by#46c0ac4c60d4 workutils: tighter an Exception Catch (closes #2282872)