Add rejectOnNotFound to update

I found this issue that relates to this request, but it is closed (not sure why).

https://github.com/prisma/prisma/issues/5032

I think it makes sense to have rejectOnNotFound on update also, and I think it is very weird that it throws an exception instead of returning null.

[vlad-rz]

Up!

[SC0d3r]

+1 for this issue, I think it should return null if record doesnt exist.

example:

const updatedUser = await prisma.user.update({
  where: {
    id: userID
  },
  data: {
    /* some changes */
  }
})

if(!updatedUser) { /* handle if update didnt happen */ }