- fix for valid < 512 byte tiles

- Don't cache "missing" proxy tile

@@ -37,5 +37,6 @@
 
 +(UIImage*) errorTile;
 +(UIImage*) loadingTile;
++(UIImage*) missingTile;
 
 @end

@@ -31,6 +31,7 @@
 
 static UIImage *_errorTile = nil;
 static UIImage *_loadingTile = nil;
+static UIImage *_missingTile = nil;
 
 + (UIImage*) errorTile
 {
@@ -48,4 +49,12 @@ static UIImage *_loadingTile = nil;
 	return _loadingTile;
 }
 
++ (UIImage*) missingTile
+{
+	if (_missingTile) return _missingTile;
+	
+	_missingTile = [[UIImage imageNamed:@"missing.png"] retain];
+	return _missingTile;
+}
+
 @end

@@ -155,7 +155,7 @@
         /// \bug magic number
 	else if(statusCode == 404) // Not Found
 	{
-		[self updateImageUsingData:UIImagePNGRepresentation([UIImage imageNamed:@"missing.png"])];
+                [super displayProxy:[RMTileProxy missingTile]];
 		[self cancelLoading];
 	}
 	else // Other Error
@@ -217,9 +217,9 @@
 
 - (void)connectionDidFinishLoading:(NSURLConnection *)_connection
 {
-        /// \bug magic number
-	if ([data length] < 512) {
+	if ([data length] == 0) {
 		//RMLog(@"connectionDidFinishLoading %@ data size %d", _connection, [data length]);
+                /// \bug magic number
                 retryCode = 512;
 		[self requestTile];
 	}