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 the structures which are defined in the current module and all
	 * included valid libraries. This method will collect all structures from
	 * this module file and each valid library.
	 * 
	 * @param propName
	 *            name of the list property
	 * @return the structure list, each of which is the instance of
	 *         <code>StructureHandle</code>
	 */
	List getStructureList( String propName )
	{
		List list = new ArrayList( );
		List tempList = getNativeStructureList( propName );
		if ( !tempList.isEmpty( ) )
			list.addAll( tempList );
		List theLibraries = getLibraries( );
		int size = theLibraries.size( );
		for ( int i = 0; i < size; i++ )
		{
			LibraryHandle library = (LibraryHandle) theLibraries.get( i );
			tempList = library.getNativeStructureList( propName );
			if ( !tempList.isEmpty( ) )
				list.addAll( tempList );
		}
		return list;
	}
	/**
	 * Returns the structures which are defined locally in the current module.
	 * This method will collect all structures from the current module file
	 * locally.