Fix, show al classification groups

dmnverifierfrontend/src/main/resources/META-INF/resources/js/dmnVerifier.js

@@ -93,6 +93,7 @@ function renderDmnVerifierOptions() {
     }
     $curGroup.append(renderSelectEntry(verifierResults.verifier[i]));
   }
+  $select.append($curGroup);
   $header.append($select);
 }