related to #1609 when node has no children, arrow is gray and not clickable rather than invisible

admin/themes/default/js/albums.js

@@ -51,6 +51,10 @@ $(document).ready(() => {
         .replace(/%id%/g, node.id)));
     } else {
       cont.find('.move-cat-order').addClass("notClickable");
+
+      cont.append($(toggler_close
+        .replace(/%content%/g, toggler)
+        .replace(/%id%/g, node.id))).addClass("disabledToggle");
     }
 
     cont.append($(icon.replace(/%icon%/g, 'icon-grip-vertical-solid')));

admin/themes/default/theme.css

@@ -5891,6 +5891,12 @@ li.plupload_delete a:hover {background: url("images/cancelhover.svg")!important;
   font-weight:600;
 }
 
+.disabledToggle .move-cat-toogler{
+  color: gray;
+  opacity: 0.5;
+  pointer-events: none;
+}
+
 /* album search */
 
 .search-album {