Update datum_pipeline.dm

code/modules/atmospherics/machinery/datum_pipeline.dm

@@ -206,7 +206,7 @@
 	. = other_airs + air
 	if(null in .)
 		stack_trace("[src]([REF(src)]) has one or more null gas mixtures, which may cause bugs. Null mixtures will not be considered in reconcile_air().")
-		return listclearnulls(.)
+		listclearnulls(.)
 
 /datum/pipeline/proc/empty()
 	for(var/datum/gas_mixture/GM in get_all_connected_airs())