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/ReportMasterPageEditor.java
ReportEditorWithRuler
{
	public ReportMasterPageEditor( )
	{
		super( );
	}
	/**
	 * @see org.eclipse.gef.ui.parts.GraphicalEditor#initializeGraphicalViewer()