LibJS: Handle getter exception in JSONObject::serialize_json_property()

In the case of an exception in a property getter function we would not
return early, and a subsequent attempt to call the replacer function
would crash the interpreter due to call_internal() asserting.

Fixes #3548.

Libraries/LibJS/Tests/builtins/JSON/JSON.stringify-exception-in-property-getter.js

@@ -0,0 +1,10 @@
+test("Issue #3548, exception in property getter with replacer function", () => {
+    const o = {
+        get foo() {
+            throw Error();
+        },
+    };
+    expect(() => {
+        JSON.stringify(o, (_, value) => value);
+    }).toThrow(Error);
+});