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
.getElement( ), root, module );
		}
		Object retValue = null;
		try
		{
			retValue = prop.validateValue( module, input );
		}
		catch ( PropertyValueException ex )
		{
			ex.setElement( element );
			ex.setPropertyName( prop.getName( ) );
			throw ex;
		}
		if ( !( retValue instanceof ElementRefValue ) )
			return retValue;
		
		
		ElementRefValue refValue = (ElementRefValue) retValue;
		if ( refValue.isResolved( )
				&& value instanceof DesignElementHandle
				&& refValue.getElement( ) != ( (DesignElementHandle) value )
						.getElement( ) )
			throw new SemanticError( element, new String[]{prop.getName( ),
					refValue.getName( )},
					SemanticError.DESIGN_EXCEPTION_INVALID_ELEMENT_REF );
		return retValue;
	}
	/**
	 * Sets the value of an intrinsic property.
	 *