build crashes on name collision with another (public) AMI also called 'template'

packer-template-collision

$ packer build ami-rhel-7.2-x86_64.json 
amazon-ebs output will be in this color.

==> amazon-ebs: Force Deregister flag found, skipping prevalidating AMI Name
==> amazon-ebs: Inspecting the source AMI...
==> amazon-ebs: Creating temporary keypair: packer 57a0b035-02ff-447f-d366-41b5b93c3369
==> amazon-ebs: Launching a source AWS instance...
    amazon-ebs: Instance ID: i-080cd371343b6baea
==> amazon-ebs: Waiting for instance (i-080cd371343b6baea) to become ready...
==> amazon-ebs: Waiting for SSH to become available...
==> amazon-ebs: Connected to SSH!
==> amazon-ebs: Stopping the source instance...
==> amazon-ebs: Waiting for the instance to stop...
==> amazon-ebs: Error deregistering existing AMI: AuthFailure: Not authorized for image:ami-2cdbca4d
==> amazon-ebs: 	status code: 400, request id:
==> amazon-ebs: Terminating the source AWS instance...
==> amazon-ebs: No AMIs to cleanup
==> amazon-ebs: Deleting temporary keypair...
Build 'amazon-ebs' errored: Error deregistering existing AMI: AuthFailure: Not authorized for image:ami-2cdbca4d
	status code: 400, request id: 

==> Some builds didn't complete successfully and had errors:
--> amazon-ebs: Error deregistering existing AMI: AuthFailure: Not authorized for image:ami-2cdbca4d
	status code: 400, request id: 

==> Builds finished but no artifacts were created.
----------------------------------------------------------------------------------

$ aws ec2 describe-images --image-id ami-2cdbca4d
{
    "Images": [
        {
            "VirtualizationType": "paravirtual", 
            "Name": "template", 
            "Hypervisor": "xen", 
            "ImageId": "ami-2cdbca4d", 
            "RootDeviceType": "ebs", 
            "State": "available", 
            "BlockDeviceMappings": [
                {
                    "DeviceName": "/dev/sda1", 
                    "Ebs": {
                        "DeleteOnTermination": false, 
                        "SnapshotId": "snap-5140680c", 
                        "VolumeSize": 8, 
                        "VolumeType": "gp2", 
                        "Encrypted": false
                    }
                }
            ], 
            "Architecture": "x86_64", 
            "ImageLocation": "004177223155/template", 
            "KernelId": "aki-fc8f11cc", 
            "OwnerId": "004177223155", 
            "RootDeviceName": "/dev/sda1", 
            "CreationDate": "2015-11-15T16:05:09.000Z", 
            "Public": true, 
            "ImageType": "machine", 
            "Description": ""
        }
    ]
}

----------------------------------------------------------------------------------

$ aws iam get-user
{
    "User": {
        "UserName": "myUserName", 
        "Path": "/", 
        "CreateDate": "2016-07-18T19:08:27Z", 
        "UserId": "IUDV26BNNVVVS1VRPZY1XX", 
        "Arn": "arn:aws:iam::323341003169:user/myUserName"
    }
}