End Date Field Displays Start Date When Left Empty

To resolve this, I added an additional check in the viewElements method to ensure that the start date is not displayed when the end date is absent and the field is configured to display only the end date.
I have created a merge request with the changes. The fix seems to work as expected in my tests now.

Please review the merge request and let me know your thoughts.
Thank you!

Updated the code to use the startDateIsDisplayed core function to check if the start date should be displayed.