message: Allow fragments only for codegen
  * Allow fragments only for codegen
  Only throw an error if we have neither operations _or_ fragments
  * Update verbage for 'no operations' error
diff: @@ -164,9 +164,9 @@ export default class Generate extends ClientCommand {
  const operations = Object.values(this.project.operations);
  const fragments = Object.values(this.project.fragments);
  - if (!operations.length) {
  + if (!operations.length && !fragments.length) {
  throw new Error(
  - "No document sets found to generate code for."
  + "No operations or fragments found to generate code for."
  );
  }
  