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/DesignElement.java
if ( container instanceof TemplateParameterDefinition )
		{
			assert containerSlotID == TemplateParameterDefinition.DEFAULT_SLOT;
			return false;
		}
		
		
		
		DesignElement element = this;
		if ( element instanceof TemplateParameterDefinition )
		{
			List clients = ( (TemplateParameterDefinition) element )
					.getClientList( );
			if ( clients.size( ) != 0 )
				return false;
		}
		return true;
	}
	/**
	 * Determines if the slot can contain a given element.
	 * 
	 * @param module
	 *            the module
	 * @param slotId
	 *            the slot id
	 * @param element
	 *            the element to insert
	 * @return a list containing exceptions.
	 */
	public final boolean canContain( Module module, int slotId,