[wmii] wmii-3.1 patch: allow empty view if current

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Hello all,

This patch enables you to create and stay in an empty view, as long
as it is the currently focused one. That is, if the currently
focused view is empty and another view becomes focused, then the
empty view will be destroyed.

AFAIK, wmii-4 will have or already has this same behavior.

You create an empty view via the "view NAME_OF_VIEW" command:

  echo -n view nonexistent_view | wmiir write /ctl

As usual, if the given view name already exists, then it just
becomes focused.

Cheers.

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