Add required rules to some FieldMapping fields

aleksis/apps/ldap/frontend/components/mappings/MappingList.vue

@@ -120,12 +120,26 @@ import DialogObjectForm from "aleksis.core/components/generic/dialogs/DialogObje
             </v-icon>
           </v-btn>
         </template>
+        <template #ldapAttribute.field="{ attrs, on }">
+          <v-text-field
+            v-bind="attrs"
+            v-on="on"
+            :rules="requiredRule"
+          />
+        </template>
         <template #useRegex.field="{ attrs, on }">
           <v-checkbox
             v-bind="attrs"
             v-on="on"
           />
         </template>
+        <template #writeTemplate.field="{ attrs, on }">
+          <v-text-field
+            v-bind="attrs"
+            v-on="on"
+            :rules="requiredRule"
+          />
+        </template>
         <template #useTemplate.field="{ attrs, on }">
           <v-checkbox
             v-bind="attrs"