updated example map generator python script

src/map.cpp

@@ -4711,6 +4711,9 @@ plan_b:
 	/*
 		Plan B: Get from map generator perlin noise function
 	*/
+	// This won't work if proper generation is disabled
+	if(m_chunksize == 0)
+		return WATER_LEVEL+2;
 	double level = base_rock_level_2d(m_seed, p2d);
 	return (s16)level;
 }

src/serialization.h

@@ -29,7 +29,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 	NOTE: The goal is to increment this so that saved maps will be
 	      loadable by any version. Other compatibility is not
 		  maintained.
-	Serialization format versions:
+	Serialization format versions (for raw map data (blocks, nodes, sectors)):
 	== Unsupported ==
 	0: original networked test with 1-byte nodes
 	1: update with 2-byte nodes