[mpris] DesktopEntry shortcomings

[Conor Curran]

>> Furthermore why isn't it mandatory to define the DesktopEntry property?
>> It's not like its something that any application could be bothered with.
>> Allows for proper context to be communicated between server and client.
> Not all applications may have a desktop file.  Consider MPD
> (http://mpd.wikia.com/), for example.
>

Ah, good point.

Conor