Bug 149251 Inconsistent Handling of a Non-inheritable ROM Property
For a ROM property defined to be non-inheritable, an empty string property value should be consistently handled as an empty string, not as null. For example, an oda.dataSource extension defines a data source property with canInherit=false. When a oda-data-source handle get saved in a report design, it correctly includes the tag for such property, even when an empty string value is specified. <oda-data-source extensionID="my.oda.plugin" name="my Data Source" id="24"> ... <property name="ApplicationServer"></property> </oda-data-source> However, later when using the DE API to read its property value, a null is returned. Then when the report design is subsequently saved, the property tag is lost. Expects that an empty string value of a non-inhertiable property should be preserved.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/command/PropertyCommand.java
* @param ref
	 *            reference to a list.
	 * @param item
	 *            the item to check
	 * @throws SemanticException
	 *             if the item has any member with invalid value or if the given
	 *             structure is not of a valid type that can be contained in the
	 *             list.
	 */
	private void checkItem( MemberRef ref, IStructure item )
			throws SemanticException
	{
		assert item != null;
		PropertyDefn propDefn = null;
		if ( ref.refType == MemberRef.PROPERTY )
		{
			propDefn = ref.getPropDefn( );
		}
		else
		{
			propDefn = ref.getMemberDefn( );
		}
		if ( item.getDefn( ) != propDefn.getStructDefn( ) )
		{
			throw new PropertyValueException( element, propDefn, item,
					PropertyValueException.DESIGN_EXCEPTION_WRONG_ITEM_TYPE );
		}
		for ( Iterator iter = item.getDefn( ).propertiesIterator( ); iter
				.hasNext( ); )
		{