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/command/PropertyCommand.java
{
	/**
	 * Constructor.
	 * 
	 * @param module
	 *            the root of <code>obj</code>
	 * @param obj
	 *            the element to modify.
	 */
	public PropertyCommand( Module module, DesignElement obj )
	{
		super( module, obj );
	}
	/**
	 * Sets the value of a property.
	 * 
	 * @param propName
	 *            the internal name of the property to set.
	 * @param value
	 *            the new property value.
	 * @throws SemanticException
	 *             if the property is not found.
	 */
	public void setProperty( String propName, Object value )
			throws SemanticException
	{
		checkAllowedOperation( );
		propName = StringUtil.trimString( propName );
		
		ElementPropertyDefn prop = element.getPropertyDefn( propName );