Issue Summary

JSM Ops Mobile App fails to create overrides on schedules that have no rotations. The mobile app renders a phantom/blank entry in the "Select Rotation" picker and submits an invalid rotation ID, resulting in the error: "Override cannot contain non existing rotation id." This issue does not occur on the Web UI, via the REST API, or when using the "Take on-call for 1 hour" option on mobile.

Steps to Reproduce

1. Create a schedule without adding any rotations.
2. Add an override via the WebUI or API for this schedule
3. Open the schedule in the Jira mobile app
4. Attempt to create a new override from the mobile app
5. Observe the "Select Rotation" picker shows a blank/empty entry.

1. Submit the override.

Expected Results

Override creation should work consistently across all clients (Web UI, API, and Mobile App), or the mobile app should display a clear and informative message if rotations are required 

Actual Results

The mobile app throws the following error:

Override cannot contain non existing rotation id 

Workaround

1. Create overrides via the Web UI or REST API, both of which handle the no-rotation scenario correctly.
2. Add at least one simple rotation to the schedule. Even a single-participant rotation resolves the issue and aligns with the intended schedule design (Schedule → Rotation → Participants → Overrides)