Updated mediawiki/extensions
Project: mediawiki/extensions/Parsoid  973dc8bb61a7d2764a48a77af6f70e3814f31368
null
Minor selser tweaks

* Don't store the serialize id in data-parsoid-serialize. It is no longer
  used.

* Add a hack to not updated the last modification status if the output from
  the wts is empty. This should be fixed properly to consider meta tags or the
  like later.

Overall 30 more selser tests are green with the hack. The ID change just makes
the output slightly less verbose.

Change-Id: Idc64687ad0db703e477fdcc8207bb5bea007ea4e