Merge pull request #4864 from Ravensdale/zetubes

Fix for problem #2891

code/game/objects/structures/transit_tubes.dm

@@ -117,12 +117,14 @@ obj/structure/ex_act(severity)
 /obj/structure/transit_tube/station/Bumped(mob/AM as mob|obj)
 	if(!pod_moving && icon_state == "open" && istype(AM, /mob))
 		for(var/obj/structure/transit_tube_pod/pod in loc)
-			if(!pod.moving && pod.dir in directions())
+			if(pod.contents.len)
+				AM << "<span class=The pod is already occupied.</span>"
+				return
+			else if(!pod.moving && pod.dir in directions())
 				AM.loc = pod
 				return
-
-
-
+			
+			
 /obj/structure/transit_tube/station/attack_hand(mob/user as mob)
 	if(!pod_moving)
 		for(var/obj/structure/transit_tube_pod/pod in loc)