Merge pull request matplotlib#106 from mdboom/gtk_crash

Gtk crash

Author: mdboom

lib/matplotlib/backends/backend_gtk.py

@@ -547,10 +547,13 @@ def notify_axes_change(fig):
 
     def destroy(self, *args):
         if _debug: print 'FigureManagerGTK.%s' % fn_name()
-        self.vbox.destroy()
-        self.window.destroy()
-        self.canvas.destroy()
-        if self.toolbar:
+        if hasattr(self, 'vbox'):
+            self.vbox.destroy()
+        if hasattr(self, 'window'):
+            self.window.destroy()
+        if hasattr(self, 'canvas'):
+            self.canvas.destroy()
+        if hasattr(self, 'toolbar'):
             self.toolbar.destroy()
         self.__dict__.clear()   #Is this needed? Other backends don't have it.