NSTabView small patch

[Adrian Robert]

Hi,

In some recent experimentation I found that NSTabView does not handle 
the case where there are no tabs (it crashes).  This is occasionally 
useful, e.g., when you have an interface with add/remove tab buttons 
and having no entries is a valid state.  Testing on OS X revealed that 
Cocoa NSTabView handles this fine.  So here is a 4-line patch to enable 
this behavior in NSTabView.

It has undergone some testing but could always use more.  It is set to 
redraw itself (to blank) when the last tab is removed, matching OS X 
behavior.

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nsTabView_zeroTabs.patch
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