[mythtv] Changeset [14771] "Reduce excessive re-parsing of database settings" brakes backend

[Nigel Pearson]

> Don't know if this helps but I just updated my master BE and couldn't
> get it to start.

Assuming it was this error:

2007-10-31 10:13:18.497 Current Schema Version: 1201
No setting found for this machine's BackendServerIP.
Please run setup on this machine and modify the first page
of the general settings

that I was just able to reproduce, yes it does.
Fix committed.

(not that I actually understand why it ever
  used to work, because Settings::GetSetting
  never used to return a NULL)

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