Updated mediawiki/extensions
Project: mediawiki/extensions/DataValues  826f8713fb4e082066bf2f6d9053da2cf7075a6e
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(bug 42997) _getRawValue implementation in commonsMedia widget

This is more like a temporary solution which implements checking for an empty string within
the commonsMedia widget. As soon as validators are implemented, the corresponding validator
should be used to validate the input.

Change-Id: I460cfc67b9806ae1471c128c076f027132b68cd0