Fix syncing if sharing is disabled server side. Fixes #2733.

[leper]

The password object is optional and not sent in case sharing is disabled.

The added test fails before the code changes in the same way as the app does.

[tobiasKaminsky]

Many thanks 🙏
Also very cool that you wrote a test!

[leper]

You're welcome. Is there any chance to get this included in a release sometime soon? That would allow me to switch a few endpoints back to app store versions.

[tobiasKaminsky]

We have released 4.5.0 RC1 this week.
If everything is fine, we will release a final next week.

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