Bug 122850 Table/list should not be able to be inserted in Master Page mode.
Description: Table/list should not be able to be inserted in Master Page mode. Steps to reproduce: 1. New a report and transfer to Master Page mode. 2. New a datasource and dataset 3. Drag a list/table to page header/footer, bind it to dataset and drag some columns inside. 4. Save and preview Expected result: Insert list/table item in master page should be forbidden. Actual result: They are allowed and preview showed "undefine" in page
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/util/ModelUtil.java
Collections.sort( temp, new Comparator( ) {
			public int compare( Object o1, Object o2 )
			{
				DesignElementHandle handle1 = (DesignElementHandle) o1;
				DesignElementHandle handle2 = (DesignElementHandle) o2;
				String name1 = handle1.getName( );
				String name2 = handle2.getName( );
				if ( null == name1 )
				{
					if ( null == name2 )
						return 0;
					return -1;
				}
				
				if ( null == name2 )
				{
					return 1;
				}
				return name1.compareTo( name2 );
			}
		} );
		return temp;
	}
	/**
	 * Inserts a default theme to the library slot.
	 * 
	 * @param library
	 *            the target library
	 * @param theme
	 *            the theme to insert