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If there are no excluded credentials then appidExclude shouldn't matter.
Previously we hit an assertion failure and crashed in this case. (See
bug.) This was introduced with M80.

BUG=1054499

Change-Id: I074ca094140feca599ab1bc59e59af1fbbcb88a0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2067387
Commit-Queue: Adam Langley <agl@chromium.org>
Commit-Queue: Martin Kreichgauer <martinkr@google.com>
Auto-Submit: Adam Langley <agl@chromium.org>
Reviewed-by: Martin Kreichgauer <martinkr@google.com>
Cr-Commit-Position: refs/heads/master@{#743387}