Merge pull request #15250 from Runa-Dacino/bloodfix

Fixes human mobs ending up with their blood datums deleted, creates fallback if that still happens

code/modules/mob/living/carbon/human/human.dm

@@ -1263,7 +1263,7 @@
 			vessel.maximum_volume = species.blood_volume
 			vessel.add_reagent("blood", species.blood_volume - vessel.total_volume)
 		else if(vessel.total_volume > species.blood_volume)
-			vessel.remove_reagent("blood", vessel.total_volume - species.blood_volume)
+			vessel.remove_reagent("blood",vessel.total_volume - species.blood_volume) //This one should stay remove_reagent to work even lack of a O_heart
 			vessel.maximum_volume = species.blood_volume
 		fixblood()
 		species.update_attack_types() //VOREStation Edit - Required for any trait that updates unarmed_types in setup.
@@ -1733,7 +1733,7 @@
 			if(blood_volume < species?.blood_volume*species?.blood_level_fatal)
 				bloodtrail = 0	//Most of it's gone already, just leave it be
 			else
-				vessel.remove_reagent("blood", 1)
+				remove_blood(1)
 		if(bloodtrail)
 			if(istype(loc, /turf/simulated))
 				var/turf/T = loc

code/modules/mob/living/simple_mob/subtypes/animal/sif/leech.dm

@@ -183,7 +183,7 @@
 
 		if(!docile && ishuman(host) && chemicals < max_chemicals)
 			var/mob/living/carbon/human/H = host
-			H.vessel.remove_reagent("blood", 1)
+			H.remove_blood(1)
 			if(!H.reagents.has_reagent("inaprovaline"))
 				H.reagents.add_reagent("inaprovaline", 1)
 			chemicals += 2