sub-man registration fails if system has checked in with puppet (and no org has been assigned)
Description of problem:
If a host has checked in with puppet, but is not assigned to any org, and you try to register it with sub-man, you get:
Validation failed: Name has already been taken
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Install satellite 6.3.0
2. Try to register the satellite to itself
Fails with "Name has already been taken"
Should register normally, and the host should be assigned to the specified org.