Prevents vampires who didn't drain anyone from being tested in the chapel (#19995)

* Update vamp_datum.dm

* Update vamp_datum.dm

vampires once again suffer in space, regardless of how much blood was drained.

* Update vamp_datum.dm

* better code, same function

* Update vamp_datum.dm

* skree where did this came from

code/modules/antagonists/vampire/vamp_datum.dm

@@ -265,7 +265,7 @@
 	handle_vampire_cloak()
 	if(isspaceturf(get_turf(owner.current)))
 		check_sun()
-	if(istype(get_area(owner.current), /area/chapel) && !get_ability(/datum/vampire_passive/full))
+	if(istype(get_area(owner.current), /area/chapel) && !get_ability(/datum/vampire_passive/full) && bloodtotal > 0)
 		vamp_burn(7)
 	nullified = max(0, nullified - 2)