[8312] - See http://tracker.modx.com/issues/8312
Allow sorting users by their "blocked" state
[#8312] Allow sorting users by blocked status

Merge remote-tracking branch 'rtripault/fix-8312' into bug-8312

* rtripault/fix-8312:
  [8312] - See http://tracker.modx.com/issues/8312 Allow sorting users by their "blocked" state