refactor: Corriger la condition de création de <ul>

src/main/java/fr/inrae/agroclim/gwtexpe/client/ui/Menu.java

@@ -139,11 +139,11 @@ implements PlaceChangeEvent.Handler {
         final Element parentLi = parentItem.getParentElement();
         final NodeList<Element> uls = parentLi.getElementsByTagName("ul");
         Element ulElem = null;
-        if (uls.getLength() == 1) {
-            ulElem = uls.getItem(0);
-        } else if (uls.getLength() == 0) {
+        if (uls.getLength() == 0) {
             ulElem = Document.get().createULElement();
             parentLi.appendChild(ulElem);
+        } else {
+            ulElem = uls.getItem(0);
         }
         final LIElement li = Document.get().createLIElement();
         li.addClassName(styleName);