Minor cleanup

modules/volume/util.lua

@@ -96,6 +96,8 @@ volume.commands = {
 					value = tonumber(string.format("% 3d", value))
 				end
 
+				-- Value will be "false" if audio not connected,
+				-- needs to be handled gracefully
 				callback({
 					mute = muted,
 					value = value