[Xmonad] darcs patch: ShellPrompt: check for executables and better error ha...

[Andrea Rossato]

Sun Oct  7 13:01:33 CEST 2007  Andrea Rossato <andrea.rossato at unibz.it>
  * ShellPrompt: check for executables and better error handling
  Code contributed by Spencer (basically I just removed FilePath
  depenency).
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