fix: cloneNode(deep, withoutLoc) handles absent comments (#12602)

This fragment (maybe all fragments?) throw during cloning, as
'comments' is unset here. Handle it being unset, by returning
undefined.

packages/babel-types/test/cloning.js

@@ -42,6 +42,14 @@ describe("cloneNode", function () {
     expect(t.isNodesEquivalent(node, cloned)).toBe(true);
   });
 
+  it("should handle deep cloning without loc of fragments", function () {
+    const program = "foo();";
+    const node = parse(program);
+    const cloned = t.cloneNode(node, /* deep */ true, /* withoutLoc */ true);
+    expect(node).not.toBe(cloned);
+    expect(t.isNodesEquivalent(node, cloned)).toBe(true);
+  });
+
   it("should handle missing array element", function () {
     const node = parse("[,0]");
     const cloned = t.cloneNode(node);