Fix min_size reference where type is None (#53669)

changelogs/fragments/53669-ec2_asg_fix_race_condition.yml

@@ -0,0 +1,2 @@
+bugfixes:
+  - ec2_asg - Fix scenario where min_size can end up passing None type to boto

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

@@ -1488,6 +1488,8 @@ def terminate_batch(connection, replace_instances, initial_instances, leftovers=
     if num_new_inst_needed == 0:
         decrement_capacity = True
         if as_group['MinSize'] != min_size:
+            if min_size is None:
+                min_size = as_group['MinSize']
             updated_params = dict(AutoScalingGroupName=as_group['AutoScalingGroupName'], MinSize=min_size)
             update_asg(connection, **updated_params)
             module.debug("Updating minimum size back to original of %s" % min_size)