Workaround for volume not being available during startup

awesome/widgets/volume-widget/volume.lua

@@ -181,9 +181,11 @@ local function worker(user_args)
         elseif mute == 'on' then widget:unmute()
         end
         local volume_level = string.match(stdout, "(%d?%d?%d)%%") -- (\d?\d?\d)\%)
+        if volume_level ~= nil then
             volume_level = string.format("% 3d", volume_level)
             widget:set_volume_level(volume_level)
         end
+    end
 
     function volume:inc(s)
         spawn.easy_async(INC_VOLUME_CMD(device, s or step), function(stdout) update_graphic(volume.widget, stdout) end)