Doug Barton f29fe35ae8 In the following scenario:
1. Start mergemaster
2. Interrupt it
3. < Somehow the temproot directory disappears >
4. mergemaster -r
Many bad things can happen, especially if the -i option is in use.

Therefore, add a check to make sure it still exists before we start
comparing files.

Brought to my attention by:
PR:		bin/40538
Submitted by:	Cyrille Lefevre <cyrille.lefevre@laposte.net>
2007-12-21 19:34:26 +00:00
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