When populating the context menu with sub-menus don't add sub-menus if they're empty.
Signed-off-by: Nikolas git-svn-id: http://svn.webkit.org/repository/webkit/trunk@27673 268f45cc-cd09-0410-ab3c-d52691b4dbfc
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Signed-off-by: Nikolas git-svn-id: http://svn.webkit.org/repository/webkit/trunk@27673 268f45cc-cd09-0410-ab3c-d52691b4dbfc