Dionaea can no longer steal blood from species which have the NO_BLOOD flag

Fixes #4510

Signed-off-by: Mloc-Argent <colmohici@gmail.com>

Conflicts:
	code/modules/mob/living/carbon/monkey/diona.dm

code/modules/mob/living/carbon/monkey/diona.dm

@@ -229,14 +229,17 @@
 	set desc = "Take a blood sample from a suitable donor."
 
 	var/list/choices = list()
-	for(var/mob/living/C in view(1,src))
-		if(C.real_name != real_name)
-			choices += C
+	for(var/mob/living/carbon/human/H in oview(1,src))
+		choices += H
 
-	var/mob/living/M = input(src,"Who do you wish to take a sample from?") in null|choices
+	var/mob/living/carbon/human/M = input(src,"Who do you wish to take a sample from?") in null|choices
 
 	if(!M || !src) return
 
+	if(M.species.flags & NO_BLOOD)
+		src << "\red That donor has no blood to take."
+		return
+
 	if(donors.Find(M.real_name))
 		src << "\red That donor offers you nothing new."
 		return