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PK11_ListCertsInSlot can return nullptr. One of the cases is that the
PKCS#11 token that is backing the slot has been removed.
Treat the nullptr return value at all call sites as no certs on the
slot.

Rationale: This happens e.g. during browsertest shut down.

Also, re-enable PlatformKeysServicePerUnavailableTokenBrowserTest which
was disabled due to this.

Bug: 1109635, 1059434
Test: 400 repetitions of PlatformKeysServicePerUnavailableTokenBrowserTest don't crash

Change-Id: I585bd6872ca91e9c10cc9fd49265afbaf414756e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2317801Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Reviewed-by: Ryan Sleevi <rsleevi@chromium.org>
Reviewed-by: Matt Mueller <mattm@chromium.org>
Reviewed-by: Omar Morsi <omorsi@google.com>
Commit-Queue: Pavol Marko <pmarko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795842}