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/metadata/ElementDefn.java
prop.setType( dd.getPropertyType( PropertyType.ELEMENT_REF_TYPE ) );
			prop.setDisplayNameID( "Element.ReportElement.style" ); 
			prop.setDetails( MetaDataConstants.STYLE_NAME );
			prop.setIntrinsic( true );
			addProperty( prop );
		}
		
		
		if ( parent != null && parent.allowsUserProperties( ) )
			supportsUserProperties = true;
		
		
		if ( isAbstract( ) && parent != null && !parent.isAbstract( ) )
			throw new MetaDataException( new String[]{name, parent.getName( )},
					MetaDataException.DESIGN_EXCEPTION_ILLEGAL_ABSTRACT_ELEMENT );
		
		if ( parent != null )
		{
			if ( nameSpaceID == MetaDataConstants.NO_NAME_SPACE )
				nameSpaceID = parent.getNameSpaceID( );
			else if ( parent.getNameSpaceID( ) != MetaDataConstants.NO_NAME_SPACE )
				throw new MetaDataException( new String[]{name},
						MetaDataException.DESIGN_EXCEPTION_INVALID_NAME_OPTION );
		}
		
		if ( !isAbstract( ) )
		{
			if ( nameSpaceID == MetaDataConstants.NO_NAME_SPACE )
				nameOption = MetaDataConstants.NO_NAME;
			if ( nameSpaceID != MetaDataConstants.NO_NAME_SPACE