message: default to field name if the field`s caption is not set
diff: @@ -16,7 +16,7 @@ exports.compute = async function(model, { format }) {
  let fieldName = field.id.split('::').pop();
  let fieldType = await field.getField('field-type');
  - let label = await field.getField('caption');
  + let label = await field.getField('caption') || fieldName;
  fieldTypes[fieldName] = { type: fieldType, label };
  }
  