[10.6] Fix LDAP login without user in DB (!5160) · Merge requests · GitLab.org / GitLab · GitLab

Douwe Maan requested to merge cherry-pick-7d017926 into 10-6-stable-ee Mar 29, 2018

Port of https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/17988

Cherry-picks 7d017926