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This will allow certificates to be typed even if we send an empty
PEM certificate which the server can act on.

Bug: 778535
Test: unit_tests
Change-Id: Iadc2d94c4cdd558dc46086b7cea629f7f92e8ae7
Reviewed-on: https://chromium-review.googlesource.com/822164Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Commit-Queue: Yves Arrouye <drcrash@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524108}