[Xmonad] darcs patch: Tabbed: check if we really have a window to focus

[Andrea Rossato]

hi,

this fixes the bug reported by Michael Vanier.

Andrea

Fri Oct  5 13:17:33 CEST 2007  Andrea Rossato <andrea.rossato at unibz.it>
  * Tabbed: check if we really have a window to focus
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