Computing it needs a DiffractionGeometry, and that refuses a detector distance under 1 mm or a pixel
size of zero. A start message can legitimately carry neither: the writer's own pre-flight check asks
it to prove it can create the files for a dataset that never describes a detector, and the master
write then threw where it used to succeed - Preflight_TCP fails at rc.166 and passes at rc.165.
The dataset is a convenience for whoever reads the file later, so where the geometry is not there to
compute it from it is simply not written. Everything else in the master is unchanged.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EFEJG6WBQv8th4UJFNe53N
leonarski_fandClaude Opus 5
4026ebc6ab