Updated mediawiki/extensions
Project: mediawiki/extensions/VisualEditor  602d01e4612d37279c7b79b373ee110006970af2
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Added tests and fixed inconsistencies for empty text node handling

Continues where Ibb682332a6084e357104183641a104e3ae1e253f left off, adding tests and removing inconsistencies between the behavior of the document constructor, which was adding empty text nodes to empty paragraphs, and correcting other tests which expected empty text nodes to be there as well.

Change-Id: I414d061cdd494b8023f14e944eda2910a4dab0d4