message: Remove ! and replace with ? in schema-block model
diff: @@ -3,12 +3,12 @@ import { attr } from '@ember-decorators/data';
  import OsfModel from './osf-model';
  export default class SchemaBlockModel extends OsfModel {
  - @attr('string') blockType!: string;
  - @attr('string') chunkId!: string;
  - @attr('string') answerId!: string;
  - @attr('string') displayText!: string;
  - @attr('string') helpText!: string;
  - @attr('boolean') required!: boolean;
  + @attr('string') blockType?: string;
  + @attr('string') chunkId?: string;
  + @attr('string') answerId?: string;
  + @attr('string') displayText?: string;
  + @attr('string') helpText?: string;
  + @attr('boolean') required?: boolean;
  }
  declare module 'ember-data/types/registries/model' {
  