fix: prevent empty page content

server/helpers/error.js

@@ -125,6 +125,10 @@ module.exports = {
     message: 'Cannot create this page because an entry already exists at the same path.',
     code: 6002
   }),
+  PageEmptyContent: CustomError('PageEmptyContent', {
+    message: 'Page content cannot be empty.',
+    code: 6004
+  }),
   PageNotFound: CustomError('PageNotFound', {
     message: 'This page does not exist.',
     code: 6003