Fixes Runtime in living_vr.dm,428: Cannot read null.name

This was happening when null is passed for belly. Now it will print *null*
Also fixed root cause (at least one of them).
Animals can't have vore attributes enabled when vore_active = 0 because
then they don't get a belly.

code/modules/mob/living/simple_mob/subtypes/animal/passive/fish_vr.dm

@@ -69,6 +69,7 @@
 	icon_dead = "measelshark-dead"
 	meat_amount = 6 //Big fish, tons of meat. Great for feasts.
 	meat_type = /obj/item/weapon/reagent_containers/food/snacks/sliceable/sharkchunk
+	vore_active = 1
 	vore_bump_chance = 100
 	vore_default_mode = DM_HOLD //docile shark
 	vore_capacity = 5