[MERGE] Handle missing tools gracefully for diff --using

Ian Clatworthy ian.clatworthy at internode.on.net
Wed Jan 2 07:32:24 GMT 2008

Ian Clatworthy has voted tweak.
Status is now: Conditionally approved
The test name should be spelt correctly, either test_execute_missing or, 
better still, test_executable_missing.

For details, see: 

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