Updated mediawiki/extensions
Project: mediawiki/extensions/MultimediaViewer  02735e3431decd236e0a05f13db5d24d14c63b11

Fix tipsy bug

maybeDisplayThumbnail is invoked even when the survey is disabled,
which results in calling functions of a null object.

Change-Id: If7a48349e22069f91af20d8c4bb6a82b7339bd66