remove "is None" from boolean tests
remove "is None" from boolean tests

276361270/sqlalchemy,Cito/sqlalchemy,graingert/sqlalchemy,robin900/sqlalchemy,halfcrazy/sqlalchemy,Cito/sqlalchemy,graingert/sqlalchemy,olemis/sqlalchemy,pdufour/sqlalchemy,bdupharm/sqlalchemy,itkovian/sqlalchemy,zzzeek/sqlalchemy,wujuguang/sqlalchemy,hsum/sqlalchemy,wfxiang08/sqlalchemy,brianv0/sqlalchemy,wujuguang/sqlalchemy,epa/sqlalchemy,davidfraser/sqlalchemy,elelianghh/sqlalchemy,inspirehep/sqlalchemy,EvaSDK/sqlalchemy,Akrog/sqlalchemy,WinterNis/sqlalchemy,alex/sqlalchemy,halfcrazy/sqlalchemy,bdupharm/sqlalchemy,Cito/sqlalchemy,EvaSDK/sqlalchemy,epa/sqlalchemy,davidjb/sqlalchemy,olemis/sqlalchemy,monetate/sqlalchemy,276361270/sqlalchemy,davidfraser/sqlalchemy,robin900/sqlalchemy,ThiefMaster/sqlalchemy,WinterNis/sqlalchemy,j5int/sqlalchemy,bootandy/sqlalchemy,alex/sqlalchemy,Akrog/sqlalchemy,itkovian/sqlalchemy,inspirehep/sqlalchemy,sandan/sqlalchemy,brianv0/sqlalchemy,dstufft/sqlalchemy,monetate/sqlalchemy,j5int/sqlalchemy,ThiefMaster/sqlalchemy,elelianghh/sqlalchemy,alex/sqlalchemy,hsum/sqlalchemy,wfxiang08/sqlalchemy,pdufour/sqlalchemy,sqlalchemy/sqlalchemy,davidjb/sqlalchemy,sandan/sqlalchemy,bootandy/sqlalchemy,dstufft/sqlalchemy