An earlier change caused TinyXml to prettyprint specifically the
contents of entities (script names and roomtext) a bit more than
before in level files, and added an unusually high amount of whitespace
(particularly, it added an empty line to every entity). This happens
because, for some reason, an empty string is explicitly being added
when creating an entity XML element. The line is so mysterious it feels
like it probably somehow solved a nasty bug long ago and shouldn't be
touched, but it was probably just a mistake, and with all that
whitespace it doesn't look good.
