Fix bug with innerwiki template

The problem was that the innerwiki template included the tiddler $:/plugins/tiddlywiki/railroad, which was omitted from the wiki. Unexpectedly, missing tiddlers were rendered by the jsontiddler widget as an empty object {}. The fix is to always include the title when the tiddler is missing.

Also cleaned up the template to remove unneeded tiddlers

core/modules/widgets/jsontiddler.js

@@ -79,6 +79,8 @@ JSONTiddlerWidget.prototype.getTiddlerFields = function() {
 		var tiddler = this.wiki.getTiddler(this.attTiddler);
 		if(tiddler) {
 			fields = tiddler.getFieldStrings({exclude: this.attExclude.split(" ")});
+		} else {
+			fields = {title: this.attTiddler};
 		}
 	}
 	return fields;