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
*            library file name
	 * @param namespace
	 *            library namespace
	 * @throws DesignFileException
	 *             if the library file is not found, or has fatal error.
	 * @throws SemanticException
	 *             if error is encountered when handling
	 *             <code>IncludeLibrary</code> structure list.
	 */
	public void includeLibrary( String libraryFileName, String namespace )
			throws DesignFileException, SemanticException
	{
		LibraryCommand command = new LibraryCommand( module );
		command.addLibrary( libraryFileName, namespace );
	}
	/**
	 * Drops the given library from the included libraries of this design file.
	 * 
	 * @param library
	 *            the library to drop
	 * @throws SemanticException
	 *             if error is encountered when handling
	 *             <code>IncludeLibrary</code> structure list. Or it maybe
	 *             because that the given library is not found in the design. Or
	 *             that the library has descedents in the current module
	 */
	public void dropLibrary( LibraryHandle library ) throws SemanticException
	{
		if ( library == null )
			return;