Vassal fold ensures you're a revenge vassal (#1196)

* Fixes vassal folding

* we gotta return it ourselves

* fix to something else entirely

* Update vassal_fold.dm

Co-authored-by: Bilbo367 <163439532+Bilbo367@users.noreply.github.com>

---------

Co-authored-by: Bilbo367 <163439532+Bilbo367@users.noreply.github.com>

fulp_modules/features/antagonists/bloodsuckers/code/powers/_powers.dm

@@ -133,7 +133,8 @@
 			if(bloodsuckerdatum_power.bloodsucker_blood_volume <= 0)
 				to_chat(user, span_warning("You don't have the blood to upkeep [src]."))
 				return FALSE
-			else if(user.blood_volume <= 0)
+		else
+			if(user.blood_volume <= 0)
 				to_chat(user, span_warning("You don't have the blood to upkeep [src]."))
 				return FALSE
 	return TRUE

fulp_modules/features/antagonists/bloodsuckers/code/powers/vassal/vassal_fold.dm

@@ -22,12 +22,13 @@
 	. = ..()
 	if(!.)
 		return FALSE
-	var/datum/antagonist/vassal/revenge/revenge_vassal = owner.mind.has_antag_datum(/datum/antagonist/ex_vassal)
-	if(revenge_vassal)
+	var/datum/antagonist/vassal/revenge/revenge_vassal = owner.mind.has_antag_datum(/datum/antagonist/vassal/revenge)
+	if(isnull(revenge_vassal))
+		stack_trace("[user] has [src] action but is not a revenge vassal. This should not be happening!")
 		return FALSE
 
 	if(trigger_flags & TRIGGER_SECONDARY_ACTION)
-		if(!revenge_vassal.ex_vassals.len)
+		if(!length(revenge_vassal.ex_vassals))
 			owner.balloon_alert(owner, "no vassals!")
 			return FALSE
 		return TRUE