Schedule - Saving on Edit after removing Repeats Until date is impossible

[PeterMis]

Create a schedule with repeats set and provide Until date & Save
Edit the Event, on Repeats tab, remove the date in 'Until' field & try to Save

At this point we will see the following errors in log:

Expecting a date in recurrenceRange but received -0NaN--NaN--NaN -NaN:-NaN:-NaN.#0 /var/www/cms/lib/Controller/Schedule.php(1052): Xibo\Service\SanitizeService->getDate('recurrenceRange') #1 [internal function]: Xibo\Controller\Schedule->edit('5') #2 /var/www/cms/vendor/akrabat/rka-slim-controller/RKA/Slim.php(79): call_user_func_array(Array, Array) #3 [internal function]: RKA\Slim->RKA\{closure}('5') #4 /var/www/cms/vendor/slim/slim/Slim/Route.php(468): call_user_func_array(Object(Closure), Array) #5 /var/www/cms/vendor/slim/slim/Slim/Slim.php(1355): Slim\Route->dispatch() #6 /var/www/cms/vendor/slim/slim/Slim/Middleware/Flash.php(85): Slim\Slim->call() #7 /var/www/cms/vendor/slim/slim/Slim/Middleware/MethodOverride.php(92): Slim\Middleware\Flash->call() #8 /var/www/cms/lib/Middleware/Actions.php(142): Slim\Middleware\MethodOverride->call() #9 /var/www/cms/lib/Middleware/Theme.php(36): Xibo\Middleware\Actions->call() #10 /var/www/cms/lib/Middleware/WebAuthentication.php(133): Xibo\Middleware\Theme->call() #11 /var/www/cms/lib/Middleware/CsrfGuard.php(62): Xibo\Middleware\WebAuthentication->call() #12 /var/www/cms/lib/Middleware/State.php(117): Xibo\Middleware\CsrfGuard->call() #13 /var/www/cms/lib/Middleware/Storage.php(47): Xibo\Middleware\State->call() #14 /var/www/cms/lib/Middleware/Xmr.php(37): Xibo\Middleware\Storage->call() #15 /var/www/cms/vendor/slim/slim/Slim/Slim.php(1300): Xibo\Middleware\Xmr->call() #16 /var/www/cms/web/index.php(124): Slim\Slim->run() #17 {main}

We would expect users to be able to remove the Until date in such scenario and save the event, as that can be done with a new event to repeat it 'forever', however on Edit when the Until field was populated, that's no longer possible.