Gets rid of ignored_factions (#94972)

## About The Pull Request

Tin, this is redundant now that faction has been moved to the atom. Also
fixes a misc runtime that can occur if someone clicks an ashwalker egg
before team datums are created

## Why It's Good For The Game

Updates code

## Changelog

Not player-facing

code/modules/mob_spawn/ghost_roles/mining_roles.dm

@@ -231,6 +231,8 @@
 	return ..()
 
 /obj/effect/mob_spawn/ghost_role/human/ash_walker/allow_spawn(mob/user, silent = FALSE)
+	if(isnull(team))
+		return FALSE
 	if(!(user.ckey in team.players_spawned))//one per person unless you get a bonus spawn
 		return TRUE
 	if(!silent)