[Xmonad] darcs patch: catch exceptions when calling user-written code.

[David Roundy]

This is an amended version of this patch (with its long comment
modified to match), since sjanssen didn't like the whenJust
catching.

David

Thu Oct 11 21:33:05 EDT 2007  David Roundy <droundy at darcs.net>
  * catch exceptions when calling user-written code.
  This is a minimal approach that only catches error
  in actual user-written code.

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