message: Fixed merging error
diff: import * as mongoose from 'mongoose';
  -import {Unit} from './Unit';
  +import {TaskUnit, Unit} from './Unit';
  import {ITaskUnit} from '../../../../shared/models/units/ITaskUnit';
  interface ITaskUnitModel extends ITaskUnit, mongoose.Document {
  @@ -51,13 +51,12 @@ const taskUnitSchema = new mongoose.Schema({
  });
  taskUnitSchema.statics.toFile = async function(unit: ITaskUnit) {
  - let fileStream = unit.description;
  + let fileStream = '';
  for (const task of unit.tasks) {
  - const newTask = await taskUnitSchema.statics.findOne(task._id);
  - fileStream = fileStream + newTask.name + '\n';
  + fileStream = fileStream + task.name + '\n';
  - for (const answer of newTask.answers) {
  + for (const answer of task.answers) {
  fileStream = fileStream + answer.text + ': [ ]\n';
  }
  fileStream = fileStream + '-------------------------------------\n';
  