Fixed invalid search bug

Steps to reproduce bug:
Open Tubalr, enter "alkhgdlsakhflkhadlhlsdhfj" to search. After failure to find anything, enter something else to search. This fails with the following trace from line 48 in file playlist.js:
```    Uncaught TypeError: Object #<U> has no method 'stopVideo' ```

After fixing that particular error, a few others emerged, similar to this one:
```
Uncaught TypeError: Cannot read property 'videoTitle' of undefined application.js:5683
Playlist.currentVideo application.js:5683
Playlist.start application.js:5619
Playlist.resultsReady application.js:5312
(anonymous function) application.js:5529
o application.js:3
p.fireWith application.js:3
w application.js:5
d.onload.d.onreadystatechange
```