Bug 155943 "Restore Properties" is always enabled for extended chart
Steps to reproduce: 1.New a report, includes a library, extends lib.chart 2.Choose the chart Expected result: "Restore Properties" is disabled untill set/change any local properties for the chart Actual result: "Restore Properties" is always enabled
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/writer/ModuleWriter.java
String source = (String) obj.getLocalProperty( getModule( ),
				ImageItem.SOURCE_PROP );
		if ( DesignChoiceConstants.IMAGE_REF_TYPE_URL.equalsIgnoreCase( source )
				|| DesignChoiceConstants.IMAGE_REF_TYPE_FILE
						.equalsIgnoreCase( source ) )
		{
			property( obj, ImageItem.URI_PROP );
		}
		else if ( DesignChoiceConstants.IMAGE_REF_TYPE_EMBED
				.equalsIgnoreCase( source ) )
		{
			property( obj, ImageItem.IMAGE_NAME_PROP );
		}
		else if ( DesignChoiceConstants.IMAGE_REF_TYPE_EXPR
				.equalsIgnoreCase( source ) )
		{
			property( obj, ImageItem.TYPE_EXPR_PROP );
			property( obj, ImageItem.VALUE_EXPR_PROP );
		}
		resourceKey( obj, ImageItem.ALT_TEXT_KEY_PROP, ImageItem.ALT_TEXT_PROP );
		resourceKey( obj, ImageItem.HELP_TEXT_ID_PROP, ImageItem.HELP_TEXT_PROP );
		writeAction( obj, ImageItem.ACTION_PROP );
		writer.endElement( );
	}
	/**
	 * Writes the action structure.
	 * 
	 * @param obj
	 *            the element containing action structure
	 * @param propName