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
* 
	 * @param propName
	 *            The style property name to make visible.
	 */
	void addStyleProperty( String propName )
	{
		assert !isBuilt;
		if ( stylePropertyNames == null )
			stylePropertyNames = new ArrayList( );
		stylePropertyNames.add( propName );
	}
	/**
	 * Gets the name space that holds this type of element.
	 * 
	 * @return The name space ID.
	 */
	public int getNameSpaceID( )
	{
		return nameSpaceID;
	}
	/**
	 * Gets the name option that says how the element type handles names. One of
	 * the following defined in {@link MetaDataConstants}:
	 * <ul>
	 * <li>{@link MetaDataConstants#NO_NAME}-- The element cannot have a name.
	 * (Probably not used.)</li>
	 * <li>{@link MetaDataConstants#OPTIONAL_NAME}-- The element can
	 * optionally have a name, but a name is not required.</li>
	 * <li>{@link MetaDataConstants#REQUIRED_NAME}-- The element must have a
	 * name.</li>