ENH:  Modified logic for needing a reference image in light of recent changes..
ENH:  Modified logic for needing a reference image in light of recent changes..

dawnsong/ANTs,dawnsong/ANTs,stnava/ANTs,dawnsong/ANTs,dawnsong/ANTs,acaprihan/Lungs,DaisukeMiyamoto/ANTs,DaisukeMiyamoto/ANTs,stnava/ANTs,fliem/ANTs,fbudin69500/ANTs,fliem/ANTs,DaisukeMiyamoto/ANTs,acaprihan/Lungs,dawnsong/ANTs,fbudin69500/ANTs,stnava/ANTs,fliem/ANTs,stnava/ANTs,stnava/ANTs,acaprihan/Lungs,acaprihan/Lungs,dawnsong/ANTs,acaprihan/Lungs,DaisukeMiyamoto/ANTs,DaisukeMiyamoto/ANTs,stnava/ANTs,fliem/ANTs,acaprihan/Lungs,fbudin69500/ANTs,dawnsong/ANTs,DaisukeMiyamoto/ANTs,fliem/ANTs,fbudin69500/ANTs,stnava/ANTs,fbudin69500/ANTs,DaisukeMiyamoto/ANTs,fbudin69500/ANTs,fliem/ANTs,fbudin69500/ANTs,fliem/ANTs