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/core/Module.java
*            the element
	 * @param nameSpace
	 *            name space
	 * @param propDefn
	 *            the property definition
	 * @return the resolved element if the name can be resolved, otherwise,
	 *         return null.
	 * 
	 * @see IModuleNameSpace#resolve(String, PropertyDefn)
	 */
	public DesignElement resolveElement( DesignElement element, int nameSpace,
			PropertyDefn propDefn )
	{
		ElementRefValue refValue = moduleNameSpaces[nameSpace].resolve(
				element, propDefn );
		return refValue.getElement( );
	}
	/**
	 * Resolves element with the given element name and name space.
	 * 
	 * @param elementName
	 *            name of the element
	 * @param nameSpace
	 *            name space
	 * @return the resolved element if the name can be resolved, otherwise,
	 *         return null.
	 */
	private DesignElement resolveNativeElement( String elementName,
			int nameSpace )
	{