add categories customization

src/components/settings/form/FormSelect.vue

@@ -22,6 +22,7 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
         v-model="model"
         :multiple="multiple"
       >
+        <option :value="null" v-if="!required"></option>
         <option
           v-for="option in options"
           :key="option.id"
@@ -49,12 +50,17 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
 <script setup>
 import { NcCheckboxRadioSwitch } from '@nextcloud/vue'
 
-const model = defineModel({ type: [Number, String, Array] })
+const model = defineModel({ type: [Number, String, Array, null] })
 const { options, expanded } = defineProps({
   options: {
     type: Array,
     required: true,
   },
+  required: {
+    type: Boolean,
+    required: false,
+    default: true,
+  },
   expanded: {
     type: Boolean,
     required: false,