CC-3880: NowPlaying-> there is no tooltip for the removed files available

-done

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

@@ -513,6 +513,16 @@ var AIRTIME = (function(AIRTIME){
                     }
                     else {
                         $image.html('<span class="ui-icon ui-icon-alert"></span>');
+                        $image.find(".ui-icon-alert").qtip({
+                            content: {
+                                text: "Airtime is unsure about the status of this file. This can happen when the file is on a remote drive that is unaccessible or the file is in a directory that isn't \"watched\" anymore."
+                            },
+                            style: {
+                                classes: "ui-tooltip-dark"
+                            },
+                            show: 'mouseover',
+                            hide: 'mouseout'
+                        });
                     }
                     
                     $node = $(nRow.children[0]);