aws ec2 wait password-data-available does not work

[jamesls]

You'll get an error because of a JMESPath type error.

$ aws ec2 wait password-data-available --instance-id i-id

In function length(), invalid type for value: None, expected one of: ['string', 'array', 'object'], received: "string"

This is because we're parsing this XML response:

<?xml version="1.0" encoding="UTF-8"?>
<GetPasswordDataResponse xmlns="http://ec2.amazonaws.com/doc/2014-10-01/">
    <requestId>id</requestId>
    <instanceId>i-id</instanceId>
    <timestamp>2015-03-30T20:53:21.000Z</timestamp>
    <passwordData/>
</GetPasswordDataResponse>

As:

{
    "InstanceId": "i-id",
    "Timestamp": "2015-03-30T20:53:21.000Z",
    "PasswordData": null
}

Whereas the waiter is assuming this is parsed with PasswordData being an empty string.

[jamesls]

Should be fixed now via boto/botocore#506