Fix case where disabledEncoder is None
Fix case where disabledEncoder is None

alfonsokim/nupic,rcrowder/nupic,numenta/nupic,neuroidss/nupic,scottpurdy/nupic,rhyolight/nupic,vitaly-krugl/nupic,vitaly-krugl/nupic,vitaly-krugl/nupic,subutai/nupic,rcrowder/nupic,numenta/nupic,rhyolight/nupic,ywcui1990/nupic,lscheinkman/nupic,rcrowder/nupic,neuroidss/nupic,ywcui1990/nupic,alfonsokim/nupic,lscheinkman/nupic,alfonsokim/nupic,numenta/nupic,scottpurdy/nupic,rhyolight/nupic,subutai/nupic,neuroidss/nupic,subutai/nupic,scottpurdy/nupic,ywcui1990/nupic,lscheinkman/nupic