It seems that some refactor that was done in the past didn't ensure backwards compatibility of some vars. See #41
Solution
Ensure backwards compatibility on the upgrade script adding some checks.
PR Status
[x] Code finished and ready to be reviewed/tested
[x] The fix/enhancement were manually tested (if applicable)
Automatic tests
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Problem
Solution
PR Status
Automatic tests
Automatic tests can be triggered on https://ci-apps-dev.yunohost.org/ after creating the PR, by commenting "!testme", "!gogogadgetoci" or "By the power of systemd, I invoke The Great App CI to test this Pull Request!". (N.B. : for this to work you need to be a member of the Yunohost-Apps organization)