[NO GBP] Fixes oil ignition, sanity checks blood DNA and adds some logging to it (#92221)

## About The Pull Request

Oil blood will no longer try to ignite twice when hit with a welder,
runtiming on the second try.
Also added crashes when ``add_blood_DNA`` is passed non-list or lists
with null assoc values, as both are invalid and cause crashes, because I
need to hunt down a stupid bug.

## Changelog
🆑
fix: Trying to ignite oil with a welding tool no longer runtimes due to
it trying to get ignited twice
/🆑

code/datums/elements/easy_ignite.dm

@@ -88,8 +88,6 @@
 
 	if (!item_ignition(source, tool, user))
 		return ITEM_INTERACT_BLOCKING
-
-	ignite(source, user)
 	return ITEM_INTERACT_SUCCESS
 
 /datum/element/easy_ignite/proc/item_ignition(obj/item/source, obj/item/tool, mob/user)