fix: handle potential null value in audits length check

Signed-off-by: Manuel Abascal <mjabascal10@gmail.com>

Author: mjabascal10

frontend/src/app/app-management/audits/audits.component.html

@@ -48,7 +48,7 @@ <h6 class="card-title mb-0 text-uppercase label-header">
           </td>
         </tr>
         </tbody>
-        <tbody *ngIf="(audits.length===0 && !loading)">
+        <tbody *ngIf="(audits?.length===0 && !loading)">
         <tr>
           <td colspan="5">
             <app-no-data-found></app-no-data-found>