<!-- Add the related story/sub-task/bug number, like Resolves#123, or
remove if NA -->
**Related issue:** Resolves#44198
Adds checks to the refetch type assertions so we both don't panic and
skip writes when we don't have data(which shouldn't really be happening,
but is a perf increase if it does). Also adds a warning if expected
fields are missing on the checkin so we can still monitor if a customer
is reporting missing fields
I cannot figure out a reliable repro for this so testing was limited to
automated tests added + some basic refetch testing(several times as I
tried to figure out how to egt the thing to send it empty)
# Checklist for submitter
If some of the following don't apply, delete the relevant line.
- [x] Changes file added for user-visible changes in `changes/`,
`orbit/changes/` or `ee/fleetd-chrome/changes`.
See [Changes
files](https://github.com/fleetdm/fleet/blob/main/docs/Contributing/guides/committing-changes.md#changes-files)
for more information.
- [x] Input data is properly validated, `SELECT *` is avoided, SQL
injection is prevented (using placeholders for values in statements), JS
inline code is prevented especially for url redirects, and untrusted
data interpolated into shell scripts/commands is validated against shell
metacharacters.
- [x] Timeouts are implemented and retries are limited to avoid infinite
loops
- [x] If paths of existing endpoints are modified without backwards
compatibility, checked the frontend/CLI for any necessary changes
## Testing
- [x] Added/updated automated tests
- [x] Where appropriate, [automated tests simulate multiple hosts and
test for host
isolation](https://github.com/fleetdm/fleet/blob/main/docs/Contributing/reference/patterns-backend.md#unit-testing)
(updates to one hosts's records do not affect another)
- [x] QA'd all new/changed functionality manually - Couldn't actually
repro the bug but tests do verify the fix
For unreleased bug fixes in a release candidate, one of:
- [x] Confirmed that the fix is not expected to adversely impact load
test results
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Bug Fixes**
* Enhanced Apple Mobile Device Management reliability by improving
server response handling. The system now gracefully processes device
information queries even when optional fields are missing or have
unexpected formats, preventing potential service interruptions and
preserving existing device data when updates are incomplete.
* **Tests**
* Added defensive unit tests covering various edge cases in Apple device
information synchronization, including scenarios with missing or
malformed data fields.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
