URL:
https://github.com/SSSD/sssd/pull/298
Title: #298: pam_sss: Fix checking of empty string cert_user
lslebodn commented:
"""
master:
* c62dc2ac02253e130991db0f6acd60ce1a2753f1
"""
See the full comment at
https://github.com/SSSD/sssd/pull/298#issuecomment-306213208