Added test for new_file after saved as none. #714
Added test for new_file after saved as none. #714

gmacon/mongoengine,reallistic/mongoengine,DavidBord/mongoengine,yarneo/mongoengine,prijindal/mongoengine,MakerReduxCorp/mongoengine,losintikfos/mongoengine,khallaghi/mongoengine,blaggacao/mongoengine,ConsumerPhysics/mongoengine,Davidrjx/mongoengine,MRigal/mongoengine,sourcelair/mongoengine,cogniteev/mongoengine,Catstyle/mongoengine,Davidrjx/mongoengine,nathanial/mongoengine,RussellLuo/mongoengine,larsbutler/mongoengine,muhammad-ammar/mongoengine,9nix00/mongoengine,eli-b/mongoengine,touilleMan/mongoengine,WingGao/mongoengine,noirbizarre/mongoengine,jimmyshen/mongoengine,MakerReduxCorp/mongoengine,ProgressivePlanning/mongoengine,starsirius/mongoengine,ms5/mongoengine,cogniteev/mongoengine,elephanter/mongoengine,MongoEngine/mongoengine,nicolascine/mongoengine,gavincabbage/mongoengine,iandd0824/mongoengine