playermd **prev** and **next** methods are causing an exception

[arne123]

Describe your problem

playermd prev and next methods are causing an exception (via mpd), when no song is played. This is very likly to happen since this functions are often used with buttons.

If possible, try to attach logs from ... (paths from RPi)

02.11.2021 21:46:07 -  766:plugs.py           - jb.plugin            - Dummy-3         - ERROR    - Detailed reason:
Traceback (most recent call last):
  File "/home/pi/RPi-Jukebox-RFID/src/jukebox/jukebox/plugs.py", line 758, in call_ignore_errors
    result = _call(package, plugin, method, args=args, kwargs=kwargs, as_thread=as_thread, thread_name=thread_name)
  File "/home/pi/RPi-Jukebox-RFID/src/jukebox/jukebox/plugs.py", line 706, in _call
    return func(*args, **kwargs)
  File "/home/pi/RPi-Jukebox-RFID/src/jukebox/components/playermpd/__init__.py", line 316, in prev
    self.mpd_client.previous()
  File "/usr/local/lib/python3.7/dist-packages/mpd/base.py", line 435, in mpd_command
    return wrapper(self, name, args, callback)
  File "/usr/local/lib/python3.7/dist-packages/mpd/base.py", line 498, in _execute
    return retval()
  File "/usr/local/lib/python3.7/dist-packages/mpd/base.py", line 420, in command_callback
    res = function(self, self._read_lines())
  File "/usr/local/lib/python3.7/dist-packages/mpd/base.py", line 353, in _parse_nothing
    for line in lines:
  File "/usr/local/lib/python3.7/dist-packages/mpd/base.py", line 552, in _read_lines
    line = self._read_line()
  File "/usr/local/lib/python3.7/dist-packages/mpd/base.py", line 541, in _read_line
    raise CommandError(error)
mpd.base.CommandError: [55@0] {} Not playing