#26 check if tiddlyweb object has been loaded by attachment to window

I came across this error when testing importing of a space from scratch.  I imported the edit space to my local system, included it, added 'editedit.js' to HtmlJavascript and loaded a tiddler to see if the "edit tiddler" link appeared.  It didn't because of this error and it does now because of this fix.