check if body contains helper element before removing it

src/lib/help-mode/help-mode.service.ts

@@ -54,7 +54,7 @@ export class HelpModeService {
     }
 
     getDocsLink(elementName: string): string {
-        return `${this._manualBaseURL}${this._docs[elementName][this._translateService.currentLang]}`;
+        return this._docs[elementName] ? `${this._manualBaseURL}${this._docs[elementName][this._translateService.currentLang]}` : '';
     }
 
     activateHelpMode(): void {
@@ -112,7 +112,9 @@ export class HelpModeService {
 
     private _disableHelperElements() {
         Object.values(this._helperElements).forEach(({ helperElement }) => {
-            document.body.removeChild(helperElement)
+            if (document.body.contains(helperElement)) {
+                document.body.removeChild(helperElement);
+            }
         });
     }
 

src/lib/listing/page-header/models/button-config.model.ts

@@ -3,5 +3,4 @@ import { ActionConfig } from './action-config.model';
 
 export interface ButtonConfig extends ActionConfig {
     readonly type?: IconButtonType;
-    readonly helpModeKey?: string;
 }

src/lib/listing/page-header/page-header.component.html

@@ -44,6 +44,7 @@
                     [icon]="config.icon"
                     [tooltip]="config.label"
                     tooltipPosition="below"
+                    [iqserHelpMode]="config.helpModeKey"
                 ></iqser-circle-button>
             </ng-container>