If no live media checkbox is made on the 2nd page then the build media step fails with a python error. The bug is line 92 of revisor/build_media.py where self.cfg.media_install is referenced, but that is an invalid variable, it should be self.cfg.media_installation.
Resolved in revisor-2.0.5-13
Metadata Update from @jjh: - Issue set to the milestone: 2.0.5 (EL-5)