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
protected String selector = null;
	/**
	 * Whether this element allows the definition of user-defined properties. If
	 * a given element does not allow user-properties, then none of its derived
	 * elements supports them either.
	 */
	protected boolean supportsUserProperties = true;
	/**
	 * List of style properties that apply to this element. Only those
	 * properties listed here are available to this element. Contents are
	 * strings.
	 */
	protected ArrayList stylePropertyNames = null;
	/**
	 * Indicates the name space in which instances of this element reside.
	 */
	protected int nameSpaceID = MetaDataConstants.NO_NAME_SPACE;
	/**
	 * Name option: one of following defined in MetaDataConstants:
	 * {@link MetaDataConstants#NO_NAME NO_NAME},
	 * {@link MetaDataConstants#OPTIONAL_NAME OPTIONAL_NAME}, or
	 * {@link MetaDataConstants#REQUIRED_NAME REQUIRED_NAME}.
	 */
	protected int nameOption = MetaDataConstants.OPTIONAL_NAME;
	/**
	 * Whether this element acts as a container. If so, which slots it
	 * implements.
	 */
	protected ArrayList slots = null;
	/**