Fix/Enh: changed all bare "except" to "except Exception".

bare except are bads/evil.

https://docs.python.org/2/howto/doanddont.html

Used:

find -type f -name '*.py' -exec egrep -q '[^a-zA-Z]except\s*\:' {} \;  -print | while read f ; do sed -i 's#\sexcept\s*\:# except Exception:#' "$f" ; done # could be a shorter one :p
Better to catch exactly the exception type that you are waiting.
Merge pull request #1376 from gst/clean_bare_except

Enh : Clean bare except