I ran the following

Tasks:
   - debug: 
      var: ansible_ssh_host_key_ecdsa_public

Received this 

 {
    "ansible_ssh_host_key_ecdsa_public": 
"AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBMj3Y7I/7ByqhoT22sBg2D0tUO8rCVQRTUQXyecCPVfXud9tnInwxXJUI8KKoIScw2YEKQuq8SPB46CE6ce6Bqw="


> On Jan 7, 2019, at 1:23 PM, Brian Coca <[email protected]> wrote:
> 
> so one of your hosts is not returning the fact for
> `ansible_ssh_host_key_ecdsa_public`, its not an issue with the
> template, but of getting the variable defined in the first place, the
> 'item' from the error will tell the first host host it is (add
> ignore_errors:yes and you'll see all the hosts that fail).
> 
> To avoid such issues you might want to use the |default() filter or
> check if the key exists before using it.
> 
> 
> --
> ----------
> Brian Coca
> 
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