Add logging to trace invalid keys. Per b/253491057, there are invalid keys (i.e. keys with value 0) being passed around on occasion. These keys are resulting in flaky test. This change adds additional error logging to help determine when the zero-valued keys are originating from. This change also removes the zx_assert to avoid crashing when a zero-value key is encountered, and instead an error is logged. TEST=built for fuchsia and tested on nest hub device. Bug: b/253491057 Change-Id: Ic94a3f526318ef2873d3af7a3ceab064b67859d5 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/268603 Reviewed-by: Zach Anderson <zra@google.com> Commit-Queue: Brian Quinlan <bquinlan@google.com> Reviewed-by: Brian Quinlan <bquinlan@google.com>
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