handle undefined formsData array

app/templates/element/peopleAutocomplete.php

@@ -86,7 +86,7 @@
           inputProps: {
             name: '<?= $htmlId ?>'
           },
-          formParams: <?= json_encode($formParams) ?>,
+          formParams: <?= json_encode($formParams ?? []) ?>,
         },
         error: ''
       }