There does not appear to be any way to do this in the convention. Looking at the tests for implementing the HasManyConvention and the methods on the IOneToManyCollectionInstance interface I don't see any way to set not-null.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.