message: fix: ensure having a truthy fallback for fields missing in schema
diff: @@ -140,7 +140,7 @@ export function useField<TValue = unknown>(
  bails,
  });
  } else {
  - result = (await form.validateSchema(false))[unref(name)];
  + result = (await form.validateSchema(false))?.[unref(name)] ?? { valid: true, errors: [] };
  }
  meta.valid = result.valid;
  