changed criteria for warning about --samples looking like invalid path
changed criteria for warning about --samples looking like invalid path

gmcvicker/WASP,gmcvicker/WASP,bmvdgeijn/WASP,bmvdgeijn/WASP,gmcvicker/WASP,bmvdgeijn/WASP,bmvdgeijn/WASP,gmcvicker/WASP