Merge pull request #404 from Uristqwerty/master

Three fixes for the Runtime Errors topic.

code/FEA/FEA_system.dm

@@ -217,7 +217,7 @@ datum
 					base.processing = 0 //singletons at startup are technically unconnected anyway
 					base.parent = null
 
-					if(base.air.check_tile_graphic())
+					if(base.air && base.air.check_tile_graphic())
 						base.update_visuals(base.air)
 
 				return null

code/game/machinery/camera.dm

@@ -214,11 +214,11 @@
 	camera_sort(L)
 
 	var/list/D = list()
-	D["Cancel"] = "Cancel"
 	for (var/obj/machinery/camera/C in L)
 		if ( C.network in src.networks )
 			D[text("[]: [][]", C.network, C.c_tag, (C.status ? null : " (Deactivated)"))] = C
 	D = camera_network_sort(D)
+	D["Cancel"] = "Cancel"
 
 	var/t = input(user, "Which camera should you change to?") as null|anything in D
 

code/game/objects/devices/scanners.dm

@@ -116,7 +116,7 @@ MASS SPECTROMETER
 				src.amount--
 				var/obj/item/weapon/f_card/F = new /obj/item/weapon/f_card( user.loc )
 				F.amount = 1
-				F.fingerprints = md5(M.dna.uni_identity)
+				F.fingerprints += md5(M.dna.uni_identity)
 				F.icon_state = "fingerprint1"
 				F.name = text("FPrintC- '[M.name]'")