widget addPersons: fix persons without birthdate

src/Bundle/ChillPersonBundle/Resources/public/vuejs/_components/AddPersons/TypePerson.vue

@@ -4,7 +4,7 @@
       <span class="name">
          {{ item.result.text }}
       </span>
-      <span class="birthday">
+      <span class="birthday" v-if="hasBirthdate">
          {{ $d(item.result.birthdate.datetime, 'short') }}
       </span>
       
@@ -31,6 +31,11 @@ export default {
    components: {
       OnTheFly
    },
-   props: ['item']
+   props: ['item'],
+   computed: {
+     hasBirthdate() {
+       return this.item.result.birthdate !== null;
+     }
+   }
 }
 </script>