[hf] safely destructure identity failure errors
* BUG SYMPTOM: some send response handlers error when they try to destructure a null `data` field * CAUSE: the `{identityFailure}` destructuring assignment unsafely assumes that all `send_message` values will have a `data` field on which we can call `data[0]` * FIX: don't assume anything about the shape of the `data` field. extract `identityFailure` from it (if it is there) with a lodash `get` call to the full path to the field we are trying to (conditionally) extract
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