Do not try to fill None
Do not try to fill None

Use case: videoob play on an unknown URL.
The get_object(... , ['url']) would throw a FieldNotFound, when the
right error should be video not found.

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