fix: Avoid RangeError when toDashedPath receives an empty dashArray

lib/src/extensions/path_extension.dart

@@ -10,7 +10,7 @@ extension DashedPath on Path {
   /// For example, the array `[5, 10]` would result in dashes 5 pixels long
   /// followed by blank spaces 10 pixels long.
   Path toDashedPath(List<int>? dashArray) {
-    if (dashArray != null) {
+    if (dashArray != null && dashArray.isNotEmpty) {
       final castedArray = dashArray.map((value) => value.toDouble()).toList();
       final dashedPath =
           dashPath(this, dashArray: CircularIntervalList<double>(castedArray));

test/extensions/path_extension_test.dart

@@ -22,4 +22,16 @@ void main() {
 
     expect(HelperMethods.equalsPaths(path1.toDashedPath([10, 5]), path2), true);
   });
+
+  test('toDashedPath returns the original path for an empty dashArray', () {
+    // Regression test: previously, passing an empty list reached
+    // `CircularIntervalList<double>([]).next` inside `dashPath()` and threw
+    // `RangeError` for any non-empty source path. An empty `dashArray` has no
+    // dashes to repeat, so the source path is returned unchanged — mirroring
+    // the existing `null` behaviour.
+    final path = Path()
+      ..moveTo(0, 0)
+      ..lineTo(10, 0);
+    expect(path.toDashedPath([]), path);
+  });
 }