Fixes area soundproofing

Fixes possible massive runtime spam spike during new round inits before mapload.

code/game/sound.dm

@@ -4,6 +4,8 @@
 		return
 
 	var/turf/turf_source = get_turf(source)
+	if(!turf_source)
+		return
 	var/area/area_source = turf_source.loc
 
 	//allocate a channel if necessary now so its the same for everyone
@@ -20,6 +22,8 @@
 		if(!M || !M.client)
 			continue
 		var/turf/T = get_turf(M)
+		if(!T)
+			continue
 		var/area/A = T.loc
 		if((A.soundproofed || area_source.soundproofed) && (A != area_source))
 			continue