Py3 fix: TypeError raised if field is not an object
Py3 fix: TypeError raised if field is not an object

xLegoz/marshmallow,jmcarp/marshmallow,0xDCA/marshmallow,jmcarp/marshmallow,bartaelterman/marshmallow,maximkulkin/marshmallow,Tim-Erwin/marshmallow,0xDCA/marshmallow,dwieeb/marshmallow,VladimirPal/marshmallow,etataurov/marshmallow,daniloakamine/marshmallow,quxiaolong1504/marshmallow,mwstobo/marshmallow,marshmallow-code/marshmallow,Bachmann1234/marshmallow