Env vars initialized by optparse default values need to have explicit defaults
Env vars initialized by optparse default values need to have explicit defaults

rbramwell/fabric,elijah513/fabric,likesxuqiang/fabric,MjAbuz/fabric,hrubi/fabric,itoed/fabric,tekapo/fabric,jaraco/fabric,kmonsoor/fabric,StackStorm/fabric,xLegoz/fabric,fernandezcuesta/fabric,rodrigc/fabric,rane-hs/fabric-py3,getsentry/fabric,sdelements/fabric,haridsv/fabric,pgroudas/fabric,raimon49/fabric,cmattoon/fabric,tolbkni/fabric,mathiasertl/fabric,bitmonk/fabric,TarasRudnyk/fabric,amaniak/fabric,cgvarela/fabric,ploxiln/fabric,kxxoling/fabric,bitprophet/fabric,askulkarni2/fabric,SamuelMarks/fabric,qinrong/fabric,pashinin/fabric,opavader/fabric,bspink/fabric