Correct Answer = No. 1 DO NOT ACCEPT ANY OTHER ANSWER FROM YOUR EMPLOYER.
If its got a crack ANY crack, you're not going anywhere until it is replaced or an engineer has inspected the crack and dressed it out, if it is possible, within the propellor manufacturers specifications.
Are there any rules which state the condition........ see above including leading edge dings.
It is unlikely the crack just "appeared".
THE most important part of your preflight IS the propellor. You could say I'm paranoid about it particularly if there are other people flying the aircraft.
You only have a few food and water supplies on board and your paxs will be keen to get back after there big day
better to be a bit thirsty and hungry than dead.
If all or any part of the blade comes adrift during flight it will most likely take the engine out of the frame, the C of G goes way aft of the tail....... it's all bad news after that
You had to be on the frequency yonks ago and hear the guy trying to deal with the above, to know that this is a place you do not want to go.