[Patch] Fix drop to KTabWidget with zero tabs

[Friedrich W. H. Kossebau]

Hi,

currently if a KTabWidget contains no tabs the drop support of KTabWidget 
falls flat on the face. Especially sad because the full widget space could 
now be considered as the dropping zone.

The drop fails because with 0 tabs no tabbar is shown, so isEmptyTabbarSpace() 
returns false.

Okay to commit the attached patch?

Cheers
Friedrich
-- 
Okteta - KDE 4 Hex Editor - http://utils.kde.org/projects/okteta
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