Title: #5810: [Backport][ipa-4-9] Catch ValueError when trying to retrieve existing
This PR was opened automatically because PR #5808 was pushed to master and backport to
ipa-4-9 is required.
To pull the PR as Git branch:
git remote add ghfreeipa https://github.com/freeipa/freeipa
git fetch ghfreeipa pull/5810/head:pr5810
git checkout pr5810