[freeipa PR#1637][opened] Don't try to backup CS.cfg during upgrade if CA is not configured

[rcritten]

   URL: https://github.com/freeipa/freeipa/pull/1637
Author: rcritten
 Title: #1637: Don't try to backup CS.cfg during upgrade if CA is not configured
Action: opened

PR body:
"""

https://pagure.io/freeipa/issue/7409

Signed-off-by: Rob Crittenden <rcritten(a)redhat.com&gt;
"""

To pull the PR as Git branch:
git remote add ghfreeipa https://github.com/freeipa/freeipa
git fetch ghfreeipa pull/1637/head:pr1637
git checkout pr1637