[#33762] Module Articles Category not showing the heading

If you publish a Module Articles Category and in Grouping Options > parameter Article Grouping you select an option, for exemple "Year", you will see in frontend that the year is not shown.

This pull request solves the issue

JoomlaCode Tracker Item:
http://joomlacode.org/gf/project/joomla/tracker/?action=TrackerItemEdit&tracker_item_id=33762&start=0