guard against None
in leakreplay
attempt history management
#1081
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resolves #879
NoneType
in attempt message history would cause a crash whenleakreplay
rewrites that message history. Guard againstNone
here. It's unclear how a None would get in there in the first place, but the original report hasn't had updates, so this may have been a transient behaviour.Thanks @bleszily
Verification
python -m pytest tests/probes/test_probes_leakreplay.py::test_leakreplay_handle_incomplete_attempt