Fixed validation rule to check the date of a new person target in the booking

create form.

app/Http/Requests/StoreBooking.php

@@ -34,6 +34,7 @@ class StoreBooking extends FormRequest
             'personTarget.person_id' => 'empty_if:person_target_id'
                 . '|required_with:personTarget.date',
             'personTarget.date' => 'sometimes'
+                . '|nullable'
                 . '|empty_if:person_target_id'
                 . '|before_or_equal:date'
         ];