Stormdrive handle_control_rod_efficiency() divides by zero, and causes runtime errors.

[jet-pack-cat]

https://github.com/BeeStation/NSV13/blob/52337049ee3e3d78d99ccb4a3549695fc92e3171/nsv13/code/modules/power/stormdrive.dm#L719C1-L723C75

NSV13/nsv13/code/modules/power/stormdrive.dm

Line 723 in 5233704

control_rod_modifier = control_rod_effectiveness_total / control_rods.len

^very sad!

ISSUE

"handle_control_rod_efficiency()" divides by zero when you remove all the rods.
When there's no rods control_rods.len = 0, and 0/0 is NAN.

STEPS TO REPRODUCE

1. PUT ROD IN
2. TAKE ROD OUT
3. RUNTIME ERROR LIKE A BOSS

This function causes many other "fun" things, and also maybe probably (definitely not) intended behavior. Have fun if you decide to fix it. :)

Could have been funnier if byond handled it differently.
Made me spend like 9 hours figuring why this was inconsistent with my simulator then realizing it was a runtime error with byond.

Client: 515.1643