ClassBuilder.isInstanceOf() will no longer throw errors when given undefined for either argument

- Yes, this is just quickly adding a test to a pre-existing, terrible format.
  This will be refactored with the rest of the test case.

lib/ClassBuilder.js

@@ -230,6 +230,11 @@ exports.isInstanceOf = function( type, instance )
 {
     var meta, implemented, i;
 
+    if ( !( type && instance ) )
+    {
+        return false;
+    }
+
     try
     {
         // check prototype chain (will throw an error if type is not a

test/test-class.js

@@ -102,6 +102,16 @@ assert.ok(
     "Class instance is recognized by Class.isInstanceOf()"
 );
 
+assert.ok(
+    Class.isInstanceOf( Foo, undefined ) === false,
+    "Checking instance of undefined will not throw an error"
+);
+
+assert.ok(
+    Class.isInstanceOf( undefined, {} ) === false,
+    "Checking for instance of undefined will not throw an error"
+);
+
 assert.ok(
     !( Class.isInstanceOf( Foo, Foo ) ),
     "Class is not an instance of itself when uninstantiated"