Merged in dev/andre/power_stack_script_handle_ASG_nonexist_StackName_…

…tag (pull request elastic#306)

improve power_stack script robustness

* improve robustness of script which was throwing KeyError for ASG that did not have StackName tag defined


Approved-by: fabien

aws/misc/stack_power.py

@@ -105,7 +105,8 @@ def auto_scaling_group(args):
     for group in res['AutoScalingGroups']:
         # parse group's tags
         tags = {tag['Key']: tag['Value'] for tag in group['Tags']}
-        if tags['StackName'] != args.stack_name:
+        stackName = tags.get('StackName')
+        if not stackName or stackName != args.stack_name:
             print('Skipping ASG', group['AutoScalingGroupName'])
             continue
         if args.power_on: