[mythtv] Backend dies when frontend lists tuner status for a tuner not bound to an input

[Bill Cizek]

>
> When a tuner is not bound to an input and the  frontend status window 
> queries tuner status, the backend dies (likely in HandleRemoteEncoder)
>

I ran into a similar problem when I was playing with a slave backend a 
while back.  Attached is my patch to fix it.  It may or may not fix your 
problem, but it's worth a try.

-Bill
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