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/extension/PeerExtensibilityProvider.java
this.extensionPropValues.remove( propName );
			}
			if ( value != null )
			{
				byte[] raw = null;
				try
				{
					raw = value.toString( ).getBytes(
							UnicodeUtil.SIGNATURE_UTF_8 );
				}
				catch ( UnsupportedEncodingException e )
				{
					assert false;
				}
				if ( reportItem != null )
					reportItem.deserialize( propName, new ByteArrayInputStream(
							raw ) );
			}
		}
	}
	/**
	 * Tests whether the property is an extension model property or not.
	 * 
	 * @param propName
	 *            name of the property to check
	 * @return true if the property is extension model property, otherwise false
	 */
	public boolean isExtensionModelProperty( String propName )