podman load dont panic when no repotags

When performing a podman load, if there were no repotags in the image, podman would panic. In
the case that the incoming image does have repotags, it should be imported as a none:none image
so it can still be used by the user.

Resolves issue #403

Signed-off-by: baude <bbaude@redhat.com>

Closes: #405
Approved by: baude
This commit is contained in:
Internal Server Error - Gitea: Git with a cup of tea
500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f