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markusro
804996cbd4
time_period is list[datetime] | None at runtime (None from old-format HDF5 files, [] from the constructor), but several sites subscripted it unguarded and crashed with TypeError/IndexError. - annotate time_period as list[datetime.datetime] | None - copy paths (get_accu_by_index, __iadd__ self-empty) use the guarded pattern already present in _copy_provenance - merges in __add__/__iadd__ only combine min/max when both sides carry time information; otherwise the result is None (provenance unknown) - write_to_tecmag raises ValueError when no time information is available instead of crashing while writing the header Clears all remaining time_period pyrefly errors (72 -> 63). Unit tests reproduce the crashes and pass with the fix. Generated by Mistral Vibe. Co-Authored-By: Mistral Vibe <vibe@mistral.ai>