Updated mediawiki/extensions
Project: mediawiki/extensions/Drafts  d160ebc6cfb165ef84fbcfebe6889d7c3810ac17
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Clear timer to null.

Next code checks if timer was started with just 'if (timer)'
which can obviously fail if the timer wasn't cleared.

Change-Id: I7090a8c9203eeebab441e12131cd91e2ca8e7877