web: add check compile test to prevent compile errors/warnings

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>

web/src/admin/outposts/OutpostForm.ts

@@ -107,6 +107,10 @@ export class OutpostForm extends ModelForm<Outpost, string> {
                             </option>`;
                         });
                     });
+            case OutpostTypeEnum.UnknownDefaultOpenApi:
+                return Promise.resolve([
+                    html` <option value="">${t`Unknown outpost type`}</option>`,
+                ]);
         }
     }