cope with an ASG instance not having a launch config any more (#57737)

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

@@ -1497,7 +1497,7 @@ def get_instances_by_launch_config(props, lc_check, initial_instances):
             # Check if migrating from launch_template to launch_config first
             if 'launch_template' in props['instance_facts'][i]:
                 old_instances.append(i)
-            elif props['instance_facts'][i]['launch_config_name'] == props['launch_config_name']:
+            elif props['instance_facts'][i].get('launch_config_name') == props['launch_config_name']:
                 new_instances.append(i)
             else:
                 old_instances.append(i)
@@ -1524,7 +1524,7 @@ def get_instances_by_launch_template(props, lt_check, initial_instances):
             # Check if migrating from launch_config_name to launch_template_name first
             if 'launch_config_name' in props['instance_facts'][i]:
                 old_instances.append(i)
-            elif props['instance_facts'][i]['launch_template'] == props['launch_template']:
+            elif props['instance_facts'][i].get('launch_template') == props['launch_template']:
                 new_instances.append(i)
             else:
                 old_instances.append(i)