Resolve "Hide useless element"

Closes #67 (closed)

web/components/management/area.js

@@ -124,6 +124,7 @@ class Area {
   }
 
   async displayAreas() {
+    document.getElementById("areas").style.display = "block";
     document.getElementById("area-list").innerHTML = /* HTML */ `<button
       id="area-new"
       class="button large-button is-success"
@@ -168,9 +169,8 @@ class Area {
 
   emptyAreas() {
     this.election = null;
-    document.getElementById("area-title").innerHTML = "Circonscriptions";
-    document.getElementById("area-list").innerHTML =
-      "Veuillez sélectionner une élection";
+    document.getElementById("sections").style.display = "none";
+    document.getElementById("desks").style.display = "none";
   }
 
   areaTemplate(area) {