fix(ShareApiClients): Maintain meaning of '' and null for share api cli…

[Fenn-CS]

Fix regression from : #44485

[Fenn-CS]

/backport to stable27

[ShGKme]

Should also be backported to 28 and 29 after #44485 is backported to 28 and 29

[Fenn-CS]

Should also be backported to 28 and 29 after #44485 is backported to 28 and 29

I would fix up? on 29 and 28? Since they are not merged yet? @ShGKme

[artonge]

/backport! to stable27

[backportbot]

The backport to stable27 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable27
git pull origin stable27

# Create the new backport branch
git checkout -b backport/45562/stable27

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts, resolve them
git cherry-pick c8a90f04

# Push the cherry pick commit to the remote repository and open a pull request
git push origin backport/45562/stable27

Error: Failed to create pull request: Validation Failed: {"resource":"PullRequest","code":"custom","message":"A pull request already exists for nextcloud:backport/45562/stable27."}

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Learn more about backports at https://docs.nextcloud.com/server/stable/go.php?to=developer-backports.

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