changes for event box component (#2710)

* changes for event box component

* changes for removing jslint errors

* Update event-box-component.js

Author: nikhilrayaprolu

app/static/js/admin/guest/explore/event-box-component.js

@@ -22,7 +22,11 @@ Vue.component('event-box', {
             return moment(this.event.start_time).format('ddd, MMM DD HH:mm A');
         },
         locationName: function () {
-            return this.event.location_name.split(",")[0];
+            if (this.event.location_name && _.isString(this.event.location_name)) {
+                return this.event.location_name.split(",")[0];
+            } else {
+                return "";
+            }
         },
         backgroundImage: function () {