[10.0] report_py3o crash when using the button "Print Invoice" when report as attachement about reporting-engine HOT 8 CLOSED

With another installation that has up-to-date code, it don't have the crash but I have another problem: when I click a second time on "Print Invoice", it creates a second attachment...

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@alexis-via is it related to #100?

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@sbidoul It seems to be older than #100

git co 8b1954e (march 6) => KO -> either crash or create
double attachements

git co 204afa0 (22 fev) => KO, crash with another error msg

git co 9f2ca7d (dec 26) => OK

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@alexis-via The 'Reload from Attachment' functionality is not implemented

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@lmignon OK, so we should consider this as a "missing feature" instead of a pure bug. And maybe we should add a note about it in the README of report_py3o.

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@alexis-via 👍

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@lmignon but, for me, this feature was working in the past (cf my test with the code of December 26)... but maybe it was not working really and was re-generating the invoice, but didn't crash.

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@lmignon @alexis-via I don't now why this commit is referenced .. I begin to migrate to V11.0 but it is WIP.

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