Cannot remove the deadline from vacature, only change it

[Ellen-Wittingen]

1. Make a vacature with a dateline set to any date and save it.
2. Edit the just created vacature and remove the date.
3. Save the vacature
4. Deadline should be gone, but is the old value

[DrumsnChocolate]

Moving this to amber-api

edit: nvm, the issue is with the frontend, as can be seen from the request payload that contains a non-null deadline

[SjoerdP]

This can be solved by adding a button to clear the datepicker (because this is not supported directly by ember pikaday)