Allow crew to have no flight hours when entering flight record

There are instances where the instructor is neither the Pilot in Command nor Co-pilot in the simulator. In an event like this, the instructor has to fill his/ her duty section without any PIC or Co-pilot hours. This will let into a warning message in his duty section saying 'Crewmember has o flight hours set'.
It is possible not to show this message if the user fills instructor hours or by any other logic.

This was shared by Sarah from RFDS SE