8289396: Fix warnings: Null pointer access: The variable instance can only be null at this location

Reviewed-by: kcr

Author: andy-goryachev-oracle

modules/javafx.graphics/src/test/java/test/javafx/css/RuleTest.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2012, 2019, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2012, 2022, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -166,17 +166,6 @@ public void testApplies() {
         fail("The test case is a prototype.");
     }
 
-    @Ignore("JDK-8234154")
-    @Test
-    public void testToString() {
-        System.out.println("toString");
-        Rule instance = null;
-        String expResult = "";
-        String result = instance.toString();
-        assertEquals(expResult, result);
-        fail("The test case is a prototype.");
-    }
-
     @Ignore("JDK-8234154")
     @Test
     public void testWriteBinary() throws Exception {