Updated mediawiki/extensions
Project: mediawiki/extensions/BlueSpiceExtensions  0f0150ef7973f97706a7e925883d211b9884f297

Fixed call on no object

In some rare cases when no user object could be created fatal error
coccured

Change-Id: I1e96d4d54bdf65d47b0c75269bcb070564ff3e16