Log full error for better debugging support (#473)

angular/src/directives/api-action.directive.ts

@@ -35,6 +35,7 @@ export class ApiActionDirective implements OnChanges {
                 this.logService.error('Captcha required error response: ' + e.getSingleMessage());
                 return;
             }
+            this.logService?.error(`Received API exception: ${e}`);
             this.validationService.showError(e);
         });
     }