message: Clean up CourseController.ts code debris
  Implements requested changes.
diff: @@ -32,7 +32,6 @@ import * as mongoose from 'mongoose';
  import {Schema} from 'mongoose';
  import ObjectId = mongoose.Types.ObjectId;
  import {IWhitelistUser} from '../../../shared/models/IWhitelistUser';
  -import Pick from '../utilities/Pick';
  const uploadOptions = {
  storage: multer.diskStorage({
  @@ -489,7 +488,7 @@ export class CourseController {
  if (index >= 0) {
  course.students.splice(index, 1);
  await NotificationSettings.findOne({'user': currentUser, 'course': course}).remove();
  - const savedCourse = await course.save();
  + await course.save();
  return {result: true};
  } else {
  // This equals an implicit !course.checkPrivileges(currentUser).userIsCourseStudent check.
  