fix: export doesn't handle lists with no cards

[magikmw]

• Resolves: [1.9.2] Export doesn't handle lists with no cards #4902
• Target version: main

Summary

If statement prevents the script from crashing in case there's a stack without any cards.
I would love if someone took a look at it, I'm not a programmer by trade.
I don't know if this requires tests, or even how to write them at this point.

One thing this still doesn't handle is exporting information about the empty stack even existing.
On import it cannot be recreated.
Probably something for a different PR though.

If needed, I'll update.

TODO

• ...

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Documentation (manuals or wiki) has been updated or is not required

[magikmw]

I've fixed the if( linter's issue, but I have no idea what's that other problem about.
Also rebase to current main.

[juliushaertl]

Fine for me without tests for now as we don't have the CSV feature covered at all yet, I might push them separately

[juliushaertl]

/backport to stable27

[juliushaertl]

/backport to stable26

[juliushaertl]

/backport to stable25

[backportbot-nextcloud]

The backport to stable25 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable25
git pull origin stable25

# Create the new backport branch
git checkout -b fix/foo-stable25

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts. Resolve them.
git cherry-pick abc123

# Push the cherry pick commit to the remote repository and open a pull request
git push origin fix/foo-stable25

More info at https://docs.nextcloud.com/server/latest/developer_manual/getting_started/development_process.html#manual-backport

[juliushaertl]

Thanks a lot for the fix :)

[juliushaertl]

Ah only there on 26 so we can skip the stable26 backport

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