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Some CTAP2 devices will return immediately if they don't recognise
credentials. This will result in the authenticators not flashing for
a request.

This change triggers a dummy make-credential operation in the event that
a get-assertion operation returns immediately because no credentials were
recognised. This makes CTAP2 behave like U2F.

Change-Id: Ic41c1115e6d9fbec292f3fb3888fb59f0476a49b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1531734
Commit-Queue: Adam Langley <agl@chromium.org>
Reviewed-by: Martin Kreichgauer <martinkr@google.com>
Cr-Commit-Position: refs/heads/master@{#644190}