Allow a default equal to None
Allow a default equal to None

get(..., default=None) will now be able to work.

sputnick-dev/weboob,RouxRC/weboob,sputnick-dev/weboob,Konubinix/weboob,willprice/weboob,willprice/weboob,willprice/weboob,Boussadia/weboob,sputnick-dev/weboob,nojhan/weboob-devel,nojhan/weboob-devel,RouxRC/weboob,Boussadia/weboob,laurent-george/weboob,Boussadia/weboob,laurent-george/weboob,RouxRC/weboob,Konubinix/weboob,laurent-george/weboob,frankrousseau/weboob,nojhan/weboob-devel,Boussadia/weboob,frankrousseau/weboob,frankrousseau/weboob,Konubinix/weboob