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
* Sets the system id of the module. It is the relative URI path of the
	 * module.
	 * 
	 * @param systemId
	 *            the system id of the module
	 * 
	 */
	public void setSystemId( URL systemId )
	{
		this.systemId = systemId;
	}
	/**
	 * Finds a theme in this module and its included modules.
	 * 
	 * @param name
	 *            Name of the style to find.
	 * @return The style, or null if the style is not found.
	 */
	public Theme findTheme( String name )
	{
		ElementRefValue refValue = moduleNameSpaces[THEME_NAME_SPACE].resolve(
				name, null );
		return (Theme) refValue.getElement( );
	}
	/**
	 * Returns the theme of the report design/library.
	 * 
	 * @return the theme of the report design/library
	 */
	public Theme getTheme( )