Fixed a bunch of the runtime errors cropping up in the server logs.

git-svn-id: http://tgstation13.googlecode.com/svn/trunk@175 316c924e-a436-60f5-8080-3fe189b3f50e

code/game/objects/items.dm

@@ -219,8 +219,9 @@
 			return safe.attackby(W, user)
 	if ((!( shielded ) || !( W.flags ) & 32))
 		spawn( 0 )
-			W.attack(src, user)
-			return
+			if (W)
+				W.attack(src, user)
+				return
 	return
 
 

code/game/objects/items/robot_parts.dm

@@ -128,8 +128,9 @@
 			O.invisibility = 0
 			O.name = "Cyborg"
 			O.real_name = "Cyborg"
-			O.lastKnownIP = src.brain.owner.client.address
+
 			if (src.brain.owner.client)
+				O.lastKnownIP = src.brain.owner.client.address
 				src.brain.owner.client.mob = O
 			else
 				for(var/mob/dead/observer/G in world)

code/game/objects/weapons.dm

@@ -130,7 +130,8 @@
 		user.show_message("\blue The timer is now secured!", 1)
 	else
 		user.show_message("\blue The timer is now unsecured!", 1)
-	src.part2.status = src.status
+	if (src.part2)
+		src.part2.status = src.status
 	src.add_fingerprint(user)
 	return