when i change system volume with my keyboard, earcandy crashes.

[AndiTheBest]

Hi,

always when i change system volume with my keyboard, i get the following error:

Traceback (most recent call last):
  File "/usr/lib/pymodules/python2.7/earcandy/PulseAudio.py", line 166, in pa_sink_input_info_cb
    self.pa_create_monitor_stream_for_sink_input(sink_input.index, self.sinks_by_id[sink_input.sink].monitor_source, sink_input.name, s.client.description)
AttributeError: 'NoneType' object has no attribute 'description'
Traceback (most recent call last):
  File "/usr/lib/pymodules/python2.7/earcandy/EarCandy.py", line 283, in __adjust_volumes
    if sink.set_volume():
  File "/usr/lib/pymodules/python2.7/earcandy/SinkInput.py", line 83, in set_volume
    if step_volume < self.client.volume_step:

and earcandy crashes.
I don't know exactly what i have done, because i don't know the code and i'm a python noob, but changing this:

    # SINK INPUTS
    def pa_sink_input_info_cb(self, sink_input, user_data):
        target_sink = self.prefer_sink_index

        if not self.sink_inputs.has_key(sink_input.index):
            s = SinkInput(sink_input.index, sink_input.name, sink_input.volume, sink_input.sink, sink_input.media_role)
            self.sink_inputs[s.index] = s

            if self.clients_by_id.has_key(sink_input.client):
                client = self.clients_by_id[sink_input.client]
                client.sinks[s.index] = s
                s.client = client

                # Skim client role from 1st stream
                if not client.role and sink_input.media_role:
                    client.role = sink_input.media_role
                    log.info("new client media role : %s %s " % (client.name, sink_input.media_role))

            self.pa_create_monitor_stream_for_sink_input(sink_input.index, self.sinks_by_id[sink_input.sink].monitor_source, sink_input.name, s.client.description)
            log.info("new sink input : %s %s " % (s.client.description, s.name))

to this:

    # SINK INPUTS
    def pa_sink_input_info_cb(self, sink_input, user_data):
        target_sink = self.prefer_sink_index

        if not self.sink_inputs.has_key(sink_input.index):

            if self.clients_by_id.has_key(sink_input.client):
                s = SinkInput(sink_input.index, sink_input.name, sink_input.volume, sink_input.sink, sink_input.media_role) #CHANGE #1
                self.sink_inputs[s.index] = s #CHANGE #2

                client = self.clients_by_id[sink_input.client]
                client.sinks[s.index] = s
                s.client = client

                # Skim client role from 1st stream
                if not client.role and sink_input.media_role:
                    client.role = sink_input.media_role
                    log.info("new client media role : %s %s " % (client.name, sink_input.media_role))

                self.pa_create_monitor_stream_for_sink_input(sink_input.index, self.sinks_by_id[sink_input.sink].monitor_source, sink_input.name, s.client.description) #CHANGE #3
                log.info("new sink input : %s %s " % (s.client.description, s.name) ) #CHANGE #4

works.
The problem is, SinkInput.client won't be set if self.clients_by_id.has_key(sink_input.client) is false.

Apart from that, nice app!

Regards, Andi