NULL EDITSTATE -> crash in TextPad 4

[Mike McCormack]

This patch fixes a crash in Textpad 4. The crash happened after open
the menu item Configure->Properties, selecting the File item, then
pressing Cancel.

ChangeLog:
 Check for NULL editstate when destroying Edit control.



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mailto:Mike_McCormack at looksmart.com.au
ph +82 16 430 0425

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