[MCH] turn error into warning and continue the scan

[pillot]

In very rare cases, data points may be reversed, triggering an error and aborting the scan. This PR turns it into a warning and let the scan continue (the data points are reordered).

[github-actions]

REQUEST FOR PRODUCTION RELEASES:
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+async-label <label1>, <label2>, !<label3> ...

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The following labels are available
async-2023-pbpb-apass4
async-2023-pp-apass4
async-2024-pp-apass1
async-2022-pp-apass7
async-2024-pp-cpass0
async-2024-PbPb-apass1
async-2024-ppRef-apass1
async-2024-PbPb-apass2
async-2023-PbPb-apass5

[davidrohr]

I assume this will never run in any online or offline scenario, but only locally on a laptop? If this runs without stdin, I guess it will just stall?

[pillot]

I assume this will never run in any online or offline scenario, but only locally on a laptop? If this runs without stdin, I guess it will just stall?

I was going to say yes, as this scan is meant to be run manually. But indeed if someone wants to run it remotely and redirect the output that could be a problem. I will turn it into a warning. Thanks!