Updated mediawiki/extensions
Project: mediawiki/extensions/VisualEditor  90f2d9f1baeed067013283d1a45a063fcd5bd248
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Initialization error when canceling load

Added check for the existence of the surface before the save dialog is hidden. This oversight caused errors when there was a load error and the user clicked cancel.

Change-Id: I3b6d8d4d9f4c81ffcbd7996d6b17ac04f33bf6d7