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/metadata/ElementDefn.java
if ( triggerDefns == null || triggerDefns.isEmpty( ) )
			return;
		Iterator iter = triggerDefns.iterator( );
		while ( iter.hasNext( ) )
		{
			SemanticTriggerDefn triggerDefn = (SemanticTriggerDefn) iter.next( );
			String targetName = triggerDefn.getTargetElement( );
			if ( StringUtil.isBlank( targetName ) )
			{
				getTriggerDefnSet( ).add( triggerDefn );
			}
			else
			{
				ElementDefn targetDefn = (ElementDefn) MetaDataDictionary
						.getInstance( ).getElement( targetName );
				if ( isKindOf( targetDefn ) )
				{
					getTriggerDefnSet( ).add( triggerDefn );
				}
			}
		}
	}
	/**
	 * Check whether the java class specify a correct class which is defined for
	 * this element definition.
	 * 
	 * @throws MetaDataException
	 *             if there is loading error or instantiating error.
	 */
	private void checkJavaClass( ) throws MetaDataException