feat: signing order (#1290)

Adds the ability to specify an optional signing order for documents.
When specified a document will be considered sequential with recipients
only being allowed to sign in the order that they were specified in.

packages/lib/server-only/template/update-template-settings.ts

@@ -33,7 +33,7 @@ export const updateTemplateSettings = async ({
   meta,
   data,
 }: UpdateTemplateSettingsOptions) => {
-  if (Object.values(data).length === 0) {
+  if (Object.values(data).length === 0 && Object.keys(meta ?? {}).length === 0) {
     throw new AppError(AppErrorCode.INVALID_BODY, 'Missing data to update');
   }