[sound_play] local variable 'filesound' referenced before assignment

[708yamaguchi]

When I use sound_play with this launch file,

  <node pkg="sound_play" type="soundplay_node.py" name="sound_play_jp"
        if="$(arg launch_sound_play)" respawn="$(arg sound_play_respawn)"
        machine="$(arg sound_play_machine)">
    <remap from="robotsound" to="robotsound_jp"/>
    <remap from="sound_play" to="robotsound_jp"/>
    <env name="PATH" value="$(find voice_text)/bin:$(env PATH)" />
  </node>

I got the following error.

[ERROR] [1653451319.526417] [/sound_play_jp:rosout]: Exception in actionlib callback: local variable 'filesound' referenced before assignment
[INFO] [1653451319.527568] [/sound_play_jp:rosout]: Traceback (most recent call last):
  File "/home/fetch/ros/melodic/src/ros-drivers/audio_common/sound_play/scripts/soundplay_node.py", line 291, in execute_cb
    sound = self.select_sound(data)
  File "/home/fetch/ros/melodic/src/ros-drivers/audio_common/sound_play/scripts/soundplay_node.py", line 109, in select_sound
    sound = filesound
UnboundLocalError: local variable 'filesound' referenced before assignment

I am still not sure why this is happening, but I'll investigate and make a PR as soon as possible.