Added a sanity check, added some feedback stuff to help identify WTF is happening with blood.

code/game/objects/items/item.dm

@@ -101,6 +101,10 @@
 			t = "huge"
 		else
 	if ((usr.mutations & CLUMSY) && prob(50)) t = "funny-looking"
+	if(!blood_DNA)
+		var/turf/Z = get_turf(src)
+		world << "\red ERROR: [src] at [Z.x], [Z.y], [Z.z] is missing it's blood_DNA list!  Tell a dev!"
+		return
 	usr << text("This is a []\icon[][]. It is a [] item.", !src.blood_DNA.len ? "" : "bloody ",src, src.name, t)
 	if(src.desc)
 		usr << src.desc