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/command/PropertyCommand.java
return true;
		if ( element.getContainer( ) != null )
		{
			DesignElement tmpContainer = element.getContainer( );
			List errors = GroupNameValidator.getInstance( )
					.validateForRenamingGroup(
							(ListingHandle) tmpContainer.getHandle( module ),
							(GroupHandle) element.getHandle( module ),
							groupName );
			if ( !errors.isEmpty( ) )
				return false;
		}
		return true;
	}
	/**
	 * Clears the value of a property.
	 * 
	 * @param propName
	 *            the name of the property to clear.
	 * @throws SemanticException
	 *             if failed to clear property.
	 */
	public void clearProperty( String propName ) throws SemanticException
	{
		setProperty( propName, null );
	}
	/**
	 * Sets the value of the member of a structure.
	 * 
	 * @param ref