Web interface does not always send all necessary data

Hello!

1) Add a few bible verses to the service.
2) Open the web interface (OpenLP Controller) in your browser.
3) Send the item live (via web interface).

Now you should see the verses in the slide controller in the web interface. Everything is fine and works as supposed.

4) Attempt to send another verse/slide live by clicking the "verse number" (see "verse_number.png").

This causes a traceback [1]. However, that is not a bug in OpenLP itself, rather in the Web Controller. See "requests.png". It shows both, clicking on the verse text (which works fine) and clicking on the "verse number". You see that the "GET" does not send a parameter (=slide number). Which explains the traceback [1]. The JS function is called "sendLiveSet" in openlp.js.

Cheers

[1]
Traceback (most recent call last):
  File "/home/andreas/Projekte/openlp/remotes/openlp/core/ui/slidecontroller.py", line 674, in onSlideSelectedIndex
    index = int(message[0])
TypeError: 'NoneType' object is unsubscriptable