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

[David Roundy]

Thu Oct 11 21:31:13 EDT 2007  David Roundy <droundy at darcs.net>
  * catch exceptions when calling user-written code.
  Note: this is a less-than-minimal approach, since it
  seemed better to put the catchX in whenJust, rather
  than in both times whenJust is used in Main.  As a
  result, it does a few potentially less efficient checks,
  but we're also slightly more robust with regard to bugs
  introduced in the future.
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