In a recent change the combobox widget was modified to automatically select the first available value in the drop-down list. This creates a problem when opening a details page that uses a combobox because the combobox will change to empty (and show the Undo button) regardless of the existing value of the field.

Steps to reproduce:
1. In the UI go to IPA Server -> Delegations.
2. Click an existing delegation.

Actual result: The "User group" and "Member user group" fields are empty and there are Undo buttons next to them.

Expected result: The fields should show the values stored in the server.