Fix variable infos for likert and likert row

projects/common/models/elements/compound-elements/likert/likert-row.ts

@@ -8,7 +8,11 @@ import {
 } from 'common/components/compound-elements/likert/likert-radio-button-group.component';
 import { environment } from 'common/environment';
 import { VariableInfo, VariableValue } from '@iqb/responses';
-import { AbstractIDService, InputElementProperties, TextImageLabel, UIElementType } from 'common/interfaces';
+import {
+  AbstractIDService,
+  InputElementProperties,
+  TextImageLabel, UIElementType
+} from 'common/interfaces';
 import { InstantiationEror } from 'common/errors';
 
 export class LikertRowElement extends InputElement implements LikertRowProperties {
@@ -41,6 +45,11 @@ export class LikertRowElement extends InputElement implements LikertRowPropertie
     }
   }
 
+  // eslint-disable-next-line class-methods-use-this
+  getVariableInfos(options?: unknown): VariableInfo[] {
+    return [];
+  }
+
   getVariableInfoOfRow(options: TextImageLabel[]): VariableInfo {
     return {
       id: this.id,

projects/common/models/elements/compound-elements/likert/likert.ts

@@ -13,7 +13,7 @@ import { VariableInfo } from '@iqb/responses';
 import {
   AbstractIDService,
   OptionElement,
-  PositionedUIElement, TextImageLabel,
+  TextImageLabel,
   UIElementProperties,
   UIElementType,
   UIElementValue
@@ -123,11 +123,13 @@ export class LikertElement extends CompoundElement implements OptionElement, Lik
   }
 
   getVariableInfos(): VariableInfo[] {
-    return this.rows.map(row => row.getVariableInfoOfRow(this.options));
+    return [...super.getVariableInfos(), ...this.rows.map(row => row.getVariableInfoOfRow(this.options))];
   }
 
   getBlueprint(): LikertElement {
-    return { ...this, rows: this.rows.map(el => el.getBlueprint()), id: undefined, alias: undefined };
+    return {
+      ...this, rows: this.rows.map(el => el.getBlueprint()), id: undefined, alias: undefined
+    };
   }
 }