Viewing recordings via UpNP: use description as subtitle when subtitle is empty

[anonymous]

The EPG subtitle info is not always present. Don't know if it's the local cable provider or a general "feature" here in Finland, but none of the entries in the recorded table has data for subtitle field.

So far this only makes browsing recordings via UpNP a little cumbersome, as the subtitle info is used distinguish episodes. Using description info when subtitle is not available could be one workaround. Attached a tiny example patch (against 0.21-fixes, looks like the same logic would go with the trunk too). Don't know if it breaks something, the string length 128 is the size of subtitle field in recorded table, just in case.

I mostly use the UpNP for playback, maybe this same thing causes problems also in another components. If so, then more general solution is needed.

[dblain]

(In [20369]) Fixes #6114 - Adds description to title if subtitle is empty