[thumbnail] remove data field in to_dict method to avoid json crash during convertion
[thumbnail] remove data field in to_dict method to avoid json crash during convertion

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