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/elements/strategy/CellPropSearchStrategy.java
* 
	 * @return the instance of <code>CellPropSearchStrategy</code>
	 */
	public static PropertySearchStrategy getInstance( )
	{
		return instance;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.core.PropertySearchStrategy#getPropertyRelatedToContainer(org.eclipse.birt.report.model.core.Module,
	 *      org.eclipse.birt.report.model.core.DesignElement,
	 *      org.eclipse.birt.report.model.metadata.ElementPropertyDefn)
	 */
	public Object getPropertyRelatedToContainer( Module module,
			DesignElement cell, ElementPropertyDefn prop )
	{
		
		
		DesignElement e = cell.getContainer( );
		while ( e != null )
		{
			Object value = e.getStrategy( ).getPropertyFromElement( module, e,
					prop );
			if ( value != null )
				return value;
			
			if ( e.getContainer( ) instanceof TableItem
					|| e.getContainer( ) instanceof GridItem )
				return getColumnProperty( module, e.getContainer( ),