Bug 153038 NPE when delete master page content in old report design.
UI/org.eclipse.birt.report.designer.ui.editors.schematic/src/org/eclipse/birt/report/designer/internal/ui/editors/layout/ReportEditorWithPalette.java
}
	/**
	 * Constructor
	 * 
	 * @param parent
	 */
	public ReportEditorWithPalette( IEditorPart parent )
	{
		this( );
	}
	
	/**
	 * @return
	 */
	protected ModelEventManager createModelEventManager()
	{
		return new ModelEventManager();
	}
	
	/**
	 * @return
	 */
	protected ModelEventManager getModelEventManager()
	{
		return manager;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.gef.ui.parts.GraphicalEditorWithFlyoutPalette#getPaletteRoot()