Bug 213680 [2.2.2]Chart script can not be cleaned completely.
Description: Reset script or delete all script does not work. build version: v20071221-0630 steps to reproduce: 1. New a report. 2. New a chart. 3. Enter some script for the chart and save the report. 4. Click the reset scirpt button or delete all script. 5. Save the report and switch to layout,then switch back to script page. Expected result: Script are cleaned. Actual result: Script are not cleaned. Note: If you delete part of the script, it works.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/writer/ModuleWriter.java
* Writers the content node out to the file.
	 * 
	 * @param node
	 *            the content node to write out
	 */
	private void writeContentNode( ContentNode node )
	{
		String tagName = node.getName( );
		boolean isCdata = node.isCDATASection( );
		writer.startElement( tagName );
		
		Map attributes = node.getAttributes( );
		Iterator keys = attributes.keySet( ).iterator( );
		while ( keys.hasNext( ) )
		{
			String key = (String) keys.next( );
			String attr = (String) attributes.get( key );
			writer.attribute( key, attr );
		}
		
		String value = node.getValue( );
		List children = node.getChildren( );
		assert StringUtil.isBlank( value ) || children.isEmpty( );
		if ( !StringUtil.isBlank( value ) )
		{
			if ( isCdata )
				writer.textCDATA( value );
			else
				writer.text( value );
		}