create default composition on first studioUI load

sites/all/modules/figli/edlp_studio/src/Controller/StudioUIController.php

@@ -157,12 +157,22 @@ class StudioUIController extends ControllerBase {
 
     $compos_ids = $query->execute();
     // dpm($compos_ids);
-    if(count($compos_ids)){
-      $compos = entity_load_multiple('composition', $compos_ids);
-    }else{
-      $compos = array();
+
+    if(!count($compos_ids)){
+      // create default compos
+      $def_compos = \Drupal::entityManager()
+        ->getStorage('composition')
+        ->create(array(
+            'name' => 'composition',
+            'uid' => $this->user->id()
+          )
+        );
+      $def_compos->save();
+      $compos_ids = array($def_compos->id());
     }
 
+    $compos = entity_load_multiple('composition', $compos_ids);
+
     $createurl = Url::fromRoute('edlp_studio.composition_controller_action_ajax', ['action' => 'create'], ['absolute' => TRUE]);
 
     return array(