Fix for #20473 - If there is no instance in the ASG, we initialize an empty array for `properties['instances']` (#20475)

lib/ansible/modules/cloud/amazon/ec2_asg.py

@@ -306,6 +306,8 @@ def get_properties(autoscaling_group):
                 properties['terminating_instances'] += 1
             if i.lifecycle_state == 'Pending':
                 properties['pending_instances'] += 1
+    else:
+        properties['instances'] = []
     properties['instance_facts'] = instance_facts
     properties['load_balancers'] = autoscaling_group.load_balancers