This bugzilla has been removed from the release and needs to be reviewed and Triaged for another Target Release.
I tested this on python-django-horizon-10.0.3-7.el7ost I created an image with a 2GB minimum disk, and a flavor with 0GB disk. I can select the flavor when that disk is selected, however, there is a warning appearing next to it, saying: "The selected image source requires a flavor with at least 2 GB of root disk. Select a flavor with a larger root disk or use a different image source.". I think there should be no warning when flavor's disk is 0.
Created attachment 1284348 [details] The warning message. Here's a screenshot of the dialog with the warning.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2017:2658