message: Empty the MediaController delete route responses
diff: @@ -134,8 +134,7 @@ export class MediaController {
  const directoryToDelete = await Directory.findById(directoryId).orFail(new NotFoundError());
  await this.checkCoursePrivilegesFor(directoryToDelete, currentUser, 'userCanEditCourse');
  await directoryToDelete.remove();
  -
  - return {success: true};
  + return {};
  }
  @Authorized(['teacher', 'admin'])
  @@ -144,8 +143,7 @@ export class MediaController {
  const fileToDelete = await File.findById(fileId).orFail(new NotFoundError());
  await this.checkCoursePrivilegesFor(fileToDelete, currentUser, 'userCanEditCourse');
  await fileToDelete.remove();
  -
  - return {success: true};
  + return {};
  }
  private async checkCoursePrivilegesFor (
  