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/Module.java
* @param imageName
	 *            the embedded image name
	 * @return the defined image that matches, or <code>null</code> if the
	 *         image name was not found in the embedded images.
	 */
	public EmbeddedImage findImage( String imageName )
	{
		StructureDefn defn = (StructureDefn) MetaDataDictionary.getInstance( )
				.getStructure( EmbeddedImage.EMBEDDED_IMAGE_STRUCT );
		return (EmbeddedImage) StructureRefUtil.findStructure( this, defn,
				imageName );
	}
	/**
	 * Gets the property definition whose detail type is of the given structure
	 * name.
	 * 
	 * @param structureName
	 *            the structure name to search
	 * @return the property definition whose detail type is of the given
	 *         structure name, otherwise null
	 */
	public ElementPropertyDefn getReferencablePropertyDefn( String structureName )
	{
		if ( referencableProperties == null )
		{
			referencableProperties = new HashMap( );
			referencableProperties.put( ConfigVariable.CONFIG_VAR_STRUCT,
					getPropertyDefn( CONFIG_VARS_PROP ) );
			referencableProperties.put( EmbeddedImage.EMBEDDED_IMAGE_STRUCT,
					getPropertyDefn( IMAGES_PROP ) );