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
* 
	 * @return the refresh rate
	 */
	public ThemeHandle getTheme( )
	{
		Theme theme = getModule( ).getTheme( module );
		if ( theme == null )
			return null;
		return (ThemeHandle) theme.getHandle( theme.getRoot( ) );
	}
	/**
	 * Sets the theme to a report.
	 * 
	 * @param theme
	 *            the theme instance
	 * @throws SemanticException
	 */
	public void setTheme( ThemeHandle theme ) throws SemanticException
	{
		ThemeCommand command = new ThemeCommand( (Module) getElement( ) );
		command.setThemeElement( theme );
	}
	/**
	 * Gets the location information of the module.
	 * 
	 * @return the location information of the module
	 */
	String getLocation( )
	{
		return getModule( ).getLocation( );