Empty hook causing deployment failure #125
Description
Hi, just run across this issue when testing a templated appspec.yml.
Apparently there is a for-each loop parsing the deployment hooks and when a hook is empty (say, it is there for reference), it fails with:
Error CodeUnknownError
Message undefined method `each' for nil:NilClass
I assume there is no validation of 'hook is nil' or 'hook is array' and yaml syntax validation is not likely to alert on this as 'mykey: ' is valid (please correct me here if I'm wrong here).
You could argue that non-used stuff should not be there, but that will require processing in the template building process to remove null value keys and, personally, I believe it would be easier to validate 'hook is array' before trying to execute it.
Just a thought.