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/api/ModuleHandle.java
* <code>onSave</code> if the save succeeds.
	 * 
	 * @param out
	 *            the output stream to which the design is written.
	 * @throws IOException
	 *             if the file cannot be written to the output stream
	 *             successfully.
	 */
	public void serialize( OutputStream out ) throws IOException
	{
		assert out != null;
		module.prepareToSave( );
		module.getWriter( ).write( out );
		module.onSave( );
	}
	/**
	 * Sets the name of the author of the design report.
	 * 
	 * @param author
	 *            the name of the author.
	 */
	public void setAuthor( String author )
	{
		try
		{
			setStringProperty( AUTHOR_PROP, author );
		}
		catch ( SemanticException e )
		{
			assert false;