fixed check for attribute 'window' by using has_attribute()

0001867: Patch containing fixes (for reporting and general)


svn: r10151

src/ManagedWindow.py

@@ -466,7 +466,7 @@ class ManagedWindow:
         if self.isWindow :
             self.present(self)
         else :
-            assert self.window, "ManagedWindow: self.window does not exist!"
+            assert self.has_attribute('window'), "ManagedWindow: self.window does not exist!"
             self.window.present()
 
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