Fixes random runtimes from RPD usage (#92246)

## About The Pull Request

SSair inits some pipes for its directional cache when RPD is used which
runtimes when atmos components try to update their icon due to assuming
they have a loc while being nullspaced.

## Changelog
🆑
fix: Fixed RPD causing runtimes when placing atmos components for the
first time.
/🆑

---------

Co-authored-by: Lucy <lucy@absolucy.moe>
(cherry picked from commit 99797151d7)

code/modules/atmospherics/machinery/components/components_base.dm

@@ -71,7 +71,7 @@
 	underlays.Cut()
 
 	color = null
-	var/uncovered_turf = HAS_TRAIT(loc, TRAIT_UNCOVERED_TURF)
+	var/uncovered_turf = loc && HAS_TRAIT(loc, TRAIT_UNCOVERED_TURF)
 	SET_PLANE_IMPLICIT(src, (underfloor_state == UNDERFLOOR_INTERACTABLE && !uncovered_turf) ? GAME_PLANE : FLOOR_PLANE)
 
 	// Layer is handled in update_layer()
@@ -112,7 +112,7 @@
 
 /obj/machinery/atmospherics/components/get_pipe_image(iconfile, iconstate, direction, color, piping_layer, trinary)
 	var/mutable_appearance/pipe_appearance = ..()
-	if (underfloor_state == UNDERFLOOR_VISIBLE || HAS_TRAIT(loc, TRAIT_UNCOVERED_TURF))
+	if (underfloor_state == UNDERFLOOR_VISIBLE || (loc && HAS_TRAIT(loc, TRAIT_UNCOVERED_TURF)))
 		pipe_appearance.layer = BELOW_CATWALK_LAYER + get_pipe_layer_offset()
 		SET_PLANE_EXPLICIT(pipe_appearance, FLOOR_PLANE, src)
 	return pipe_appearance