[ VM ] Fix failing assert when requesting system isolates immediately after startup It's possible for VM service clients to request information about isolates before they've been marked as runnable. Updated the assert to allow for the kNone service event to handle this case. Fixes https://github.com/dart-lang/sdk/issues/43170 Change-Id: If03d9f6659714408381d5d2e9f9b1d75a83e82a3 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/161761 Commit-Queue: Ben Konyi <bkonyi@google.com> Reviewed-by: Alexander Aprelev <aam@google.com>
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