modified some comments in tweet-listener.js
YQLService.js: trap for when json.query is null. sometimes, when the text contains apostrophe or quotes (or other problem characters?), it confounds the YQLService.  In these cases, the json.query comes back null and causes an app-exploding exception.  I have tried unescaping the text, and that didn't seem to do any good.  so for the time being, I'm just trapping for jquery.query == null.