Don't log expected error on each guest function call #662
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Currently, 3 error records gets logged for each guest function call, successful or not. This is because the way we check if an error happened is by trying to deserialize a GuestError. If this deserialization fails (which it does in case of a successful guest function call), 3 errors gets logged. See #497 for more info.
This PR is just a short term fix. We should not rely on this "trying to deserialize an error" for error handling. I'm leaving the linked issue open, so that we can address this properly in the future.