Try to play sound on all unix systems

sys.platform == 'linux' excludeds other unix systems, for example FreeBSD

gajim/common/helpers.py

@@ -767,8 +767,15 @@ def play_sound_file(path_to_soundfile):
         except Exception:
             log.exception('Sound Playback Error')
 
-    elif sys.platform == 'linux':
-        if app.config.get('soundplayer') == '':
+    elif sys.platform == 'darwin':
+        if not HAS_SOUND:
+            log.error('NSSound not available')
+            return
+        sound = NSSound.alloc()
+        sound.initWithContentsOfFile_byReference_(path_to_soundfile, True)
+        sound.play()
+
+    elif app.config.get('soundplayer') == '':
         def _oss_play():
             sndfile = wave.open(path_to_soundfile, 'rb')
             nc, sw, fr, nf, _comptype, _compname = sndfile.getparams()
@@ -778,14 +785,11 @@ def play_sound_file(path_to_soundfile):
             sndfile.close()
             dev.close()
         app.thread_interface(_oss_play)
-            return
+
+    else:
         player = app.config.get('soundplayer')
         command = build_command(player, path_to_soundfile)
         exec_command(command)
-    elif sys.platform == 'darwin' and HAS_SOUND:
-        sound = NSSound.alloc()
-        sound.initWithContentsOfFile_byReference_(path_to_soundfile, True)
-        sound.play()
 
 def get_global_show():
     maxi = 0