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
*            reference to the member to set
	 * @param value
	 *            new value of the member
	 * @throws SemanticException
	 *             if the value is not valid
	 */
	public void setMember( MemberRef ref, Object value )
			throws SemanticException
	{
		PropertyDefn memberDefn = ref.getMemberDefn( );
		PropertyDefn propDefn = ref.getPropDefn( );
		assert propDefn != null;
		assertExtendedElement( module, element, propDefn );
		assert memberDefn != null;
		value = memberDefn.validateValue( module, value );
		
		
		if ( memberDefn.getTypeCode( ) == PropertyType.NAME_TYPE
				|| memberDefn.getTypeCode( ) == PropertyType.MEMBER_KEY_TYPE )
			checkItemName( ref, (String) value );
		
		
		
		Object oldValue = ref.getLocalValue( module, element );
		if ( oldValue == null && value == null )
			return;
		if ( oldValue != null && value != null && oldValue.equals( value ) )
			return;
		
		ActivityStack stack = getActivityStack( );