Allow wxSplitterWindow::Initialize(NULL) in case we've deleted both child

windows and want to clean up dangling pointers


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_4_BRANCH@27852 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/splitter.cpp

@@ -801,7 +801,7 @@ void wxSplitterWindow::SizeWindows()
 // Set pane for unsplit window
 void wxSplitterWindow::Initialize(wxWindow *window)
 {
-    wxASSERT_MSG( window && window->GetParent() == this,
+    wxASSERT_MSG( (!window || (window && window->GetParent() == this)),
                   _T("windows in the splitter should have it as parent!") );
 
     m_windowOne = window;