message: Add a message when there are no variables
diff: @@ -727,6 +727,14 @@ export class RunEditor extends React.Component<Props, State> {
  return (
  <div className="run-editor-tab">
  + {
  + fields.length === 0 &&
  + <table className="table">
  + <tbody className="table-body">
  + <tr><td><p>There are currently no Speedrun.com variables or custom variables for this game.</p></td></tr>
  + </tbody>
  + </table>
  + }
  <SettingsComponent
  factory={new JsonSettingValueFactory()}
  state={{ fields }}
  