Updated mediawiki/extensions
Project: mediawiki/extensions/Scribunto  af0f1926f47c2f1624be1404f56d366cfde63efa
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Fix mw.allToString( nil )

This should return "nil", not the empty string.

Change-Id: I6363e5ca8c1966e45eec9d05fb583fb4f98a92b5