Don't draw if no paint is active

crates/typst-pdf/src/shape.rs

@@ -56,10 +56,13 @@ pub(crate) fn handle_shape(
             None
         };
 
+        // Otherwise, krilla will by default fill with a black paint.
+        if fill.is_some() || stroke.is_some() {
             surface.set_fill(fill);
             surface.set_stroke(stroke);
             surface.draw_path(&path);
         }
+    }
 
     surface.pop();
     surface.reset_location();