Guard the custom formatter for a Map against errors Change-Id: Iee245fffb7bd2d19b55b8007d7c3afb17acf0577 Reviewed-on: https://dart-review.googlesource.com/c/92143 Reviewed-by: Jenny Messerly <jmesserly@google.com> Commit-Queue: Alan Knight <alanknight@google.com>
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