[BUG] RandomLeafFilter constructor will divide by zero during unit test.

[stolk]

Environment

Debian Trixie

Describe the bug

With FP exceptions enabled, the unit test will throw a FP exception for the RandomLeafFilter code, as it will divide by zero.

To Reproduce

Enable FP exceptions (MR that adds toggle for this will follow.)

Expected behavior

No FP exception thrown.

Additional context

I have a fix, will create MR.