Updated mediawiki/extensions
Project: mediawiki/extensions/Bootstrap  6ca65453d7f83a3ec09e962ee42c9a1d3c14e7be

Fix removing of Less compiler class from autoloader

For newer versions of MW (~1.25+) the lessc compiler is pulled in by Composer.
This means we can not just set the respective entry in the classmap to null
anymore, but have to check if there is some entry present already.

Change-Id: I3fa0bb05cbaf3c8699ece0b849e11ae12acf09dd