Issue #3325447 by sujan.shrestha: Warning Upon creating new transaction

src/Entity/EtTransaction.php

@@ -680,10 +680,12 @@ class EtTransaction extends ContentEntityBase implements EtTransactionInterface
    */
   public function preSave(EntityStorageInterface $storage) {
     parent::preSave($storage);
-    foreach ($this->choice as $choice_item) {
-      if ($choice_item->entity && $choice_item->entity->needsSaving()) {
-        $choice_item->entity->save();
-        $choice_item->target_id = $choice_item->entity->id();
+    if (!empty($this->choice)) {
+      foreach ($this->choice as $choice_item) {
+        if ($choice_item->entity && $choice_item->entity->needsSaving()) {
+          $choice_item->entity->save();
+          $choice_item->target_id = $choice_item->entity->id();
+        }
       }
     }