User blog comment:DaNASCAT/Technical Update: January 6, 2016/@comment-25648422-20160113023123/@comment-126761-20160113111534

Generally, no - a while ago we updated the import code to check the Dev Wiki MediaWiki namespace, so that users wouldn't have to edit their JS.

However, there is an issue where this is triggering an error message on communities that don't have community JS enabled, but we're working on a quick fix for that.