Undefined array key "target_bundles" NodeOrderManager.php:250

Problem/Motivation

When a node has an entity reference field using a view, Node Order will through a warning :

 [warning] Undefined array key "target_bundles" NodeOrderManager.php:250
 [warning] foreach() argument must be of type array|object, null given NodeOrderManager.php:250

Steps to reproduce

1. Create a node with an entity reference field using a view
2. Create a new node

Proposed resolution

1. Add a condition to avoid the warning
2. Analyse the view to determine if it is a taxonomy term view

Remaining tasks

Analyse the view to determine if it is a taxonomy term view.