Importer permissions (#8419)

* Improved permission checking for data importing

- Permission checks on the imported model type

* Improved validation for DateField

* Fix for unit test

src/frontend/src/components/forms/fields/DateField.tsx

@@ -39,11 +39,18 @@ export default function DateField({
     [field.onChange, definition]
   );
 
-  const dateValue = useMemo(() => {
+  const dateValue: Date | null = useMemo(() => {
+    let dv: Date | null = null;
+
     if (field.value) {
-      return new Date(field.value);
+      dv = new Date(field.value) ?? null;
+    }
+
+    // Ensure that the date is valid
+    if (dv instanceof Date && !isNaN(dv.getTime())) {
+      return dv;
     } else {
-      return undefined;
+      return null;
     }
   }, [field.value]);