message: fix: don't validate contributors-input
diff: @@ -19,6 +19,9 @@ export function buildValidation(groups: SchemaBlockGroup[]) {
  const { inputBlock } = group;
  let requiredMessage = translations.validationErrors.blank;
  switch (group.groupType) {
  + case 'contributors-input':
  + // No validation for contributors input.
  + return;
  case 'short-text-input':
  break;
  case 'long-text-input':
  