colours of workers availability are not triggered when time/date is changed
- colours of workers availability changed only when Appointment type is changed.
- color does not change and availability is not 0% when appointment length = 0.
- when none worker is chosen, the previous worker availability is displayed.
movie here pass = test
path: /Users/ewa.smula/ownCloud/TestsSMASCH/issue-smasch-463.mov