PLA-262 -- better handling of empty values for MWS match instantiation by domain
PLA-262 updated match extraction to be a method of abstract select class and invoked by both OnWiki and InterWiki query services
Merge branch 'PLA-262-b' into dev

Conflicts:
	extensions/wikia/Search/classes/QueryService/Select/InterWiki.php
	extensions/wikia/Search/classes/Test/QueryService/Select/InterWikiTest.php