ssh: Fix parsing of "authorize" message "response" for empty
ssh: Fix parsing of "authorize" message "response" for empty

We can receive empty "response" field in an "authorize" if there
is nothing to answer a response, or a prompt was cancelled.

Closes #6310
Reviewed-by: Dominik Perpeet <f7830b2723a5db4fc185058b06cfab4b89a38da9@redhat.com>

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