Immediately stopping and playing appears to cause crash

[Gert-dev]

Describe the bug
When telling the bot to stop and immediately play afterwards, it crashes.

Affected version
Commit e5a2d810fc0fb2443582af07ca1b3d75cbaec8c6 or tag 7.1 - only translation updates have happened on master at the time of writing.

To Reproduce
Steps to reproduce the behavior:

1. Start the music bot with an empty playlist (e.g. fresh install).
2. In Mumble, send the command !stop.
3. In Mumble, send the command !play.

Expected behavior
The bot does not crash and does nothing instead.

Additional context

Traceback (most recent call last):
  File "mumbleBot.py", line 881, in <module>
    var.bot.loop()
  File "mumbleBot.py", line 543, in loop
    current = var.playlist.current_item()
  File "/home/user/botamusique/media/playlist.py", line 257, in current_item
    return self[self.current_index]
IndexError: list index out of range

[TerryGeng]

Sorry for the late reply. Problem reproduced. Investigating...

[TerryGeng]

I posted a quick fix. Can you have a look?

[Gert-dev]

I can confirm it's fixed with latest master, thanks!