fixup: add compatibility with missing __code__ attribute
In order to apply nexedi/erp5@4115e465 it is needed to upgrade an existing side which only contains func_code
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In order to apply nexedi/erp5@4115e465 it is needed to upgrade an existing side which only contains func_code
mentioned in commit c0265bad
·mentioned in commit c0265bad
mentioned in commit b247fb0a
·mentioned in commit b247fb0a