Pin to version 2.6.6 of empty.html.
Pin to version 2.6.6 of empty.html.

2.7.0 has unicode errors as described in:

    https://github.com/TiddlyWiki/tiddlywiki/issues/115

tiddlyweb/tiddlywebwiki,tiddlyweb/tiddlywebwiki,tiddlyweb/tiddlywebwiki