disable sound if pulseaudio server is not reachable

[tirolerstefan]

In my configuration with no installed pulse audio server, the following import triggered no exception:

(app.py ~ line 90)

        if prefs.sound:
            try:
                from kazam.pulseaudio.pulseaudio import pulseaudio_q
                prefs.sound = True
            except:
                logger.warning("Pulse Audio Failed to load. Sound recording disabled.")
                prefs.sound = False

but the connection to the sound server failed here:

(app.py ~ line 120)

        if prefs.sound:
            prefs.pa_q = pulseaudio_q()
            prefs.pa_q.start()

Solved this by putting above lines in a try-except block and disabled sound on exception. works!