On vérifie que le transitionChoice n'est pas vide

src/Controller/ArticleController.php

@@ -50,7 +50,7 @@ final class ArticleController extends AbstractController
 
         if ($form->isSubmitted() && $form->isValid()) {
             $publicationChoice = $form->get('publicationChoice')->getData();
-            if ($publicationChoice !== "") {
+            if ($publicationChoice !== null) {
                 $workflow->apply($article, $publicationChoice);
             }
 
@@ -99,7 +99,7 @@ final class ArticleController extends AbstractController
 
         if ($form->isSubmitted() && $form->isValid()) {
             $publicationChoice = $form->get('publicationChoice')->getData();
-            if ($publicationChoice !== "") {
+            if ($publicationChoice !== null) {
                 $workflow->apply($article, $publicationChoice);
             }