From 6b899d096d7be2e587f83b73c006538251b7b6da Mon Sep 17 00:00:00 2001
From: "jason@long.name" <jason@long.name@d9718cc8-9f43-0410-858b-315f434eb58c>
Date: Mon, 9 Sep 2013 14:11:39 +0000
Subject: [PATCH] MakeTiles: tolerate undefined tiles

git-svn-id: https://micropolis.googlecode.com/svn/trunk/micropolis-java@852 d9718cc8-9f43-0410-858b-315f434eb58c
---
 src/micropolisj/build_tool/MakeTiles.java | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/micropolisj/build_tool/MakeTiles.java b/src/micropolisj/build_tool/MakeTiles.java
index 0e3bde9..2ff7eb3 100644
--- a/src/micropolisj/build_tool/MakeTiles.java
+++ b/src/micropolisj/build_tool/MakeTiles.java
@@ -53,7 +53,9 @@ public class MakeTiles
 		for (int i = 0; i < NTILES; i++) {
 			int tileNumber = SKIP_TILES + i;
 			String rawSpec = recipe.getProperty(Integer.toString(tileNumber));
-			assert rawSpec != null;
+			if (rawSpec == null) {
+				continue;
+			}
 
 			TileSpec tileSpec = TileSpec.parse(tileNumber, rawSpec, recipe);
 			FrameSpec ref = parseFrameSpec(tileSpec);