show more output cells when space is available

src/marble_engine/board.rs

@@ -227,7 +227,7 @@ impl Board {
 				if self.in_bounds((tx, ty).into()) {
 					let tile = self.rows[ty][tx];
 					let texname = tile.texture();
-					if texname == "" {
+					if texname.is_empty() {
 						continue;
 					}
 					let texture = textures.get(&texname);