"What if" grades request

I only have a simple request I suggest you can help with. In the grades for each of the classes you can change the score on an assignment/test to see what you would have in the class were you to get it. However, It doesn’t let you see what you would have if the assignment is worth no points. I only ask because sometimes assignments might be a temporary 0 and I don’t know what my real grade is without it.