Merge pull request #1222 from Datraen/XenoarchSpawnFix

[XENOARCH] Checks to see if the turf is a floor before spawning artifacts.

code/modules/research/xenoarchaeology/master_controller.dm

@@ -9,9 +9,12 @@
 #define ARTIFACTSPAWNNUM_LOWER 6
 #define ARTIFACTSPAWNNUM_UPPER 12
 
-datum/controller/game_controller/proc/SetupXenoarch()
+/datum/controller/game_controller/proc/SetupXenoarch()
 	//create digsites
 	for(var/turf/simulated/mineral/M in block(locate(1,1,1), locate(world.maxx, world.maxy, world.maxz)))
+		if(M.density)
+			continue
+			
 		if(isnull(M.geologic_data))
 			M.geologic_data = new/datum/geosample(M)