[SSSD] [sssd PR#87][opened] SYSDB: Only process aliases if they are non-NULL

[fidencio]

URL: https://github.com/SSSD/sssd/pull/87
Author: jhrozek
 Title: #87: SYSDB: Only process aliases if they are non-NULL
Action: opened

PR body:
"""
This bug was found by downstream coverity check.

The aliases array is created by sysdb_get_sudo_user_info() which returns a NULL array if there are no aliases. We need to avoid dereferencing the array in that case.
"""

To pull the PR as Git branch:
git remote add ghsssd https://github.com/SSSD/sssd
git fetch ghsssd pull/87/head:pr87
git checkout pr87