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
Structure inherited = (Structure) element
				.getProperty( module, propDefn );
		if ( inherited != null )
		{
			IStructure copy = inherited.copy( );
			PropertyRecord propRecord = new PropertyRecord( element, propDefn,
					copy );
			getActivityStack( ).execute( propRecord );
		}
		return;
	}
	/**
	 * Check to see whether the reference points to a list.
	 * 
	 * @param ref
	 *            reference to the list into which to add the structure
	 * @throws PropertyValueException
	 *             if the <code>ref</code> doesn't refer a list property or
	 *             member.
	 */
	private void checkListMemberRef( MemberRef ref )
			throws PropertyValueException
	{
		if ( !ref.isListRef( ) )
			throw new PropertyValueException( element, ref.getPropDefn( ),
					null, PropertyValueException.DESIGN_EXCEPTION_NOT_LIST_TYPE );
	}
	/**
	 * Validates the values of the item members.
	 *