[pygobject] Remove "label" property from Gtk.MenuItem if it is not set

[Martin Pitt <martinpitt src gnome org>]

commit a96a26234e2aaa157837d26094864e3ad9b63edf
Author: Micah Carrick <micah quixotix com>
Date:   Mon Jun 25 09:05:59 2012 -0700

    Remove "label" property from Gtk.MenuItem if it is not set
    
    The Gtk.MenuItem will not render as a separator if the "label" or
    "user-underline" properties have been accessed. The constructor
    for Gtk.MenuItem override should not pass the "label" property
    as an argument if it is None since that will still result in an
    empty label widget which breaks Gtk.SeparatorMenuItem.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=670575
    
    Signed-off-by: Martin Pitt <martinpitt gnome org>

 gi/overrides/Gtk.py |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/gi/overrides/Gtk.py b/gi/overrides/Gtk.py
index ff4de24..08b3a4b 100644
--- a/gi/overrides/Gtk.py
+++ b/gi/overrides/Gtk.py
@@ -334,7 +334,10 @@ __all__.append('SizeGroup')
 
 class MenuItem(Gtk.MenuItem):
     def __init__(self, label=None, **kwds):
-        super(MenuItem, self).__init__(label=label, **kwds)
+        if label:
+            super(MenuItem, self).__init__(label=label, **kwds)
+        else:
+            super(MenuItem, self).__init__(**kwds)
 
 MenuItem = override(MenuItem)
 __all__.append('MenuItem')