Tweaks to fix up my optimizatinos

* Fixed a rendering glitch with empty shows in the Now Playing screen
* Changed drag and drop placeholder to show the track name. Reverted it
  from the default DataTables placeholder, which unfortunately gets the
  column widths wrong.

airtime_mvc/public/js/airtime/showbuilder/main_builder.js

@@ -168,7 +168,7 @@ AIRTIME = (function(AIRTIME) {
         $builder.find(dateStartId)
         	.datepicker(oBaseDatePickerSettings)
         	.blur(validateTimeRange);
-        
+
         $builder.find(timeStartId)
         	.timepicker(oBaseTimePickerSettings)
         	.blur(validateTimeRange);