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Fix retrieval of the effective user groups

Authored by Kghbln on Aug 2 2016, 7:41 AM.

Description

Fix retrieval of the effective user groups

Restores compatibility with MediaWiki 1.27+. Patch provided by user
Javawookie (https://phabricator.wikimedia.org/p/Javawookie/)

Bug: T137051
Change-Id: Ia19982f764c53395c7fb32d12d7aab669bbbeef4

Details