message: Feature#586: Check if course exists
  Adjusted check if id is 24 characters long.
diff: @@ -221,7 +221,7 @@ export class CourseController {
  async getCourse(@Param('id') id: string, @CurrentUser() currentUser: IUser) {
  const regex = /[g-z]/gi; // Check if id only contains characters from a-f
  - if (id.search(regex) !== -1 || id.length === 24) {
  + if (id.search(regex) !== -1 || id.length !== 24) {
  throw new NotFoundError();
  }
  