fix volume and backlight OSD(new dependency) fix icon_handler causing crash if client had no .class or .name prop

awesome/src/widgets/audio.lua

@@ -59,8 +59,7 @@ return function()
     local get_volume = function()
         awful.spawn.easy_async_with_shell(
             [[ 
-                SINK="$(pacmd stat | awk -F": " '/^Default sink name: /{print $2}')"
-                echo $(pacmd list-sinks | awk '/^\s+name: /{indefault = $2 == "<'$SINK'>"} /^\s+volume: / && indefault {print $5; exit}')
+                pacmd list-sinks|grep -A 15 '* index'| awk '/volume: front/{ print $5 }' | sed 's/[%|,]//g'
             ]],
             function(stdout)
                 local icon = icondir .. "volume"