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/api/ModuleHandle.java
*            information, either relative or absolute directory. And the
	 *            file should be on the local disk.
	 * @return the library handle with the given file name
	 */
	public LibraryHandle findLibrary( String fileName )
	{
		URL url = module.findResource( fileName, IResourceLocator.LIBRARY );
		if ( url == null )
			return null;
		Module library = module.getLibraryByLocation( url.toString( ) );
		if ( library == null )
			return null;
		return (LibraryHandle) library.getHandle( library );
	}
	/**
	 * Shifts the library to new position. This method might affect the style
	 * reference, because the library order is changed.
	 * 
	 * @param library
	 *            the library to shift
	 * @param toPosn
	 *            the new position
	 * @throws SemanticException
	 *             if error is encountered when shifting
	 */
	public void shiftLibrary( LibraryHandle library, int toPosn )
			throws SemanticException
	{
		if ( library == null )
			return;