Bug 142432 MasterPage from library can't be restored to modify
Details: MasterPage from library can't be restored to modify Step: 1.New a library named lib1, and insert a masterpage named lib-mp. 2.Publish the library into resource folder. 3.New a report design and use lib1. 4.Drop the lib-mp from library explorer into outline of report design. 5.Double click lib-mp, and switch to Property editro tab. 6.Click restore. Actual result: Pop up an error message and said that the master page cannot specify size the page type is not custom.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/command/NameCommand.java
/**
	 * Implementation of dropping a symbol from a name space. No need to do the
	 * drop if the current name is null.
	 */
	private void dropSymbol( )
	{
		if ( element.getName( ) == null )
			return;
		int ns = ( (ElementDefn) element.getDefn( ) ).getNameSpaceID( );
		if ( module.getNameSpace( ns ).getElement( element.getName( ) ) != element )
			return;
		getActivityStack( ).execute(
				new NameSpaceRecord( getModule( ), ns, element, false ) );
	}
	/**
	 * Renames the namespace when call {@link #setName(String)}.
	 * 
	 * @param oldName
	 *            the old name of the element
	 */
	private void renameSymbolFrom( String oldName )
	{
		
		
		
		if ( element.isManagedByNameSpace( ) )
		{
			RenameInNameSpaceRecord record = new RenameInNameSpaceRecord(
					getModule( ), element, oldName, element.getName( ) );
			getActivityStack( ).execute( record );