Function checked_div 

pub fn checked_div<T>(num: T, den: T) -> Option<T>
where
    T: Float,

Divides two floats or returns None if the denominator is zero or if any inputs are NaN. Rust provides checked_div, but not for floats, so this function is needed.

Here is an example:

use veloren_common::util::div::checked_div;

assert!(checked_div(50.0_f32, 0.0_f32).is_none());