shift popover logic a bit to fix chance of undefined error

src/js/widgets/search_bar/search_bar_widget.js

@@ -195,14 +195,6 @@ define([
       this.$input = $input;
       renderAutocomplete($input);
 
-      $input.popover({
-        placement: 'bottom',
-        title: 'Empty Search!',
-        content: 'Please enter a query to search.',
-        animation: true,
-        trigger: 'manual',
-      });
-
       this.$('[data-toggle="tooltip"]').tooltip();
     },
 
@@ -432,13 +424,25 @@ define([
         !this.model.get('bigquery')
       ) {
         // show a popup to tell the user to type in a query
-        $input.popover('show');
-        $input.on('input change blur', function () {
+        $input
+        .popover({
+          placement: 'bottom',
+          title: 'Empty Search!',
+          content: 'Please enter a query to search.',
+          animation: true,
+          trigger: 'manual',
+        })
+        .popover('show');
+
+        $input.on('input change blur', function() {
           $(this).popover('hide');
         });
         return false;
       }
-      $input.popover('hide');
+
+      if (typeof $input.popover === 'function') {
+        $input.popover('hide');
+      }
 
       // replace uppercased fields with lowercase
       query = query.replace(/([A-Z])\w+:/g, function (letter) {