grappling hooks re-reforked

if the original creator wants me to take it down i will

all I did was move the this.shootingEntity != null check into the first line
theoretically an early exit should occur and it won't be used if it doesn't exist
thereby removing the occurance of that error
the second line checks if this.shootingEntity is null in the original version
that check is run too late
https://www.curseforge.com/minecraft/mc-mods/grappling-hook-mod original creator