[cloud] EC2 AutoScaling fix for respecting zero as the desired, min&max size values (#27870)

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

@@ -942,9 +942,9 @@ def create_autoscaling_group(connection, module):
                     attach_lb_target_groups(connection, group_name, tgs_to_attach)
 
         # check for attributes that aren't required for updating an existing ASG
-        desired_capacity = desired_capacity or as_group['DesiredCapacity']
+        desired_capacity = desired_capacity if desired_capacity is not None else as_group['DesiredCapacity']
-        min_size = min_size or as_group['MinSize']
+        min_size = min_size if min_size is not None else as_group['MinSize']
-        max_size = max_size or as_group['MaxSize']
+        max_size = max_size if max_size is not None else as_group['MaxSize']
         launch_config_name = launch_config_name or as_group['LaunchConfigurationName']
 
         launch_configs = describe_launch_configurations(connection, launch_config_name)