Crash when editing externals property

Hi,

I'd like to report a crash within TortoiseSVN 1.7.

Steps to reproduce:
1. Within a working copy folder, right click and choose "Properties"
2. On the Subversion tab, click "Properties..."
3. Click "New" --> "Externals"
4. Make sure the list of externals is empty
5. Click on "Remove"

I know, there is no reason to click that button in that situation,
but nevertheless it shouldn't crash :)
By the way, the "Edit" button ignores a click in the same situation.

Tested with
TortoiseSVN 1.7.99, Build 22134 - 64 Bit -dev, 2011/10/19 21:46:04
Subversion 1.7.1, -dev
apr 1.4.5
apr-utils 1.3.12
neon 0.29.6
OpenSSL 1.0.0e 6 Sep 2011
zlib 1.2.5

-- 
Best regards,
Michael 'Sidewinder' Geisinger
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