Print: use hasWidget function

js/widgets/widget-print.js

@@ -70,7 +70,7 @@
 			// columnSelector -> c.selector.$style
 			// Assume 'visible' means hidden columns have a 'display:none' style, or a class name
 			// add the definition to the wo.print_extraCSS option
-			if (/s/i.test(wo.print_columns) && c.selector && c.widgets.indexOf('columnSelector') >= 0) {
+			if (/s/i.test(wo.print_columns) && c.selector && ts.hasWidget( c.table, 'columnSelector' )) {
 				// show selected (visible) columns; make a copy of the columnSelector widget css (not media queries)
 				printStyle += wo.columnSelector_mediaquery && c.selector.auto ? '' : c.selector.$style.text();
 			} else if (/a/i.test(wo.print_columns)) {