skip empty pin list value

src/Controller/ModuleController.php

@@ -102,10 +102,13 @@ class ModuleController extends AbstractController
         // Create rooms list
         $list = [];
 
+        if ($this->getParameter('app.kevacoin.room.namespaces.pinned'))
+        {
             foreach ((array) explode('|', $this->getParameter('app.kevacoin.room.namespaces.pinned')) as $room)
             {
                 $list[] = $room;
             }
+        }
 
         // Append custom valid namespace to the rooms list menu
         if (!in_array($request->get('namespace'), $list) && preg_match('/^N[A-z0-9]{33}$/', $request->get('namespace')))