share/ShareJS — pull request #336 by zag2art (2014-09-08 11:44:21+00:00)
Title: Bugfix: don't emit 'extra' event if extra === 0

So, in racer it doesn't update model. For example, for query = model.query('items', {$count, $query{}});
If I subscribe for the query and have only one doc, and then I delete the doc, the model for the query will not be updated.

The patch fix this.