CC-3174 : timeline

don't highlight empty timeline.

airtime_mvc/public/js/airtime/showbuilder/builder.js

@@ -413,9 +413,12 @@ var AIRTIME = (function(AIRTIME){
 					
 					//if there is only 1 cursor on the page highlight it by default.
 					if ($cursorRows.length === 1) {
+						$td = $cursorRows.find("td:first");
+				    	if (!$td.hasClass("dataTables_empty")) {
 				    		$cursorRows.addClass("cursor-selected-row");
 				    	}
 					}
+				}
 				
 				//order of importance of elements for setting the next timeout.
 				elements = [