"Show Next N" misbehaves in Log dialog for deleted files

The "Next N" button in the Show Log dialog fails to retrieve
proper next nnn log values if the dialog was called on a file
that does not exist in the HEAD revision.

TortoiseSVN 1.5.9, Build 15518

Steps to reproduce:
1. Checkout /svn/tortoisesvn/trunk/src/LogCache at revision 15190
(not the HEAD!)
2. Go to Settings dialog, -> Log Caching -> delete log cache for
tortoisesvn repository
3. Go to Settings dialog, -> General -> Dialogs 1 -> set "Default
number of log messages" = "2"
4. Ask for the log for the LogCacheSettigns.cpp file.

I am asked for the password three times, but the result is good: I am shown two
lines of the log history.

5. Press the "Next 2" button.

I am asked for the password two times, and result -> see "4_revs.png". There
are duplicated lines.

6. Press the "Next 2" button.

I am asked for the password two times, and result -> more duplicate entries.

The "2x10_revs.png" is for my own repository, when configured to show 10 log
messages and the Next button was pressed once.

In TSVN 1.5.8 the result was the same, though I was also presented with
the "Go offline?" dialog, which is now fixed in 1.5.9. Thanks for fixing that.

> - BUG: Showing Log for deleted paths should not trigger "go offline? dialog.
> (Stefan Fuhrmann)

Best regards,
Konstantin Kolinko

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