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
* Returns data source handles that are visible to this modules.
	 * 
	 * @return data source handles that are visible to this modules.
	 */
	public List getVisibleDataSources( )
	{
		IModuleNameSpace namescope = module
				.getModuleNameSpace( Module.DATA_SOURCE_NAME_SPACE );
		List elementList = namescope
				.getElements( IModuleNameSpace.NATIVE_LEVEL );
		return generateHandleList( elementList );
	}
	/**
	 * Returns all data set handles that this modules and the included modules
	 * contain.
	 * 
	 * @return all data set handles that this modules and the included modules
	 *         contain.
	 */
	public List getAllDataSets( )
	{
		IModuleNameSpace namescope = module
				.getModuleNameSpace( Module.DATA_SET_NAME_SPACE );
		List elementList = namescope
				.getElements( IModuleNameSpace.ARBITARY_LEVEL );
		return generateHandleList( elementList );
	}
	/**
	 * Returns data set handles that are visible to this modules.
	 *