Schedule Event: Add Form Modal Doesn't Close on Save When Criteria is Added

[nadzpogi]

Steps:

1. Go to the "Schedule" page and click [Add Event].
2. Fill in the required details under the "General" tab.
3. Fill in any details under the "Criteria" tab.
4. Click the "Save" button.

Expected Behavior:

• The form should save the event, close the modal, and show a success message.

Actual Behavior:

• The modal remains open, and the "Save" button shows a continuous loading state.
• The page is still operable, but the modal does not close as expected.
• When page is refreshed, you can see that the form is successfully saved.
• Schedule response in developer tools shows <br/><b>Warning</b>: foreach() argument must be of type array|object, null given in <b>/lib/Entity/Schedule.php</b> on line <b>503</b><br/>...

[dasgarner]

This also needs to be cherry-picked into release40 please