Default options to empty {}

Summary:
API Key is not longer required.

Test Plan:
http://www.naitik.dev575.snc1.facebook.com/fbconnect/tests/index.html?initialize&api

DiffCamp Revision: 113927
Reviewed By: alpjor
CC: platform-diffs@lists, lshepard, brent, mattwkelly, alpjor, selekman
Revert Plan:
OK

src/core/init.js

@@ -125,7 +125,7 @@ FB.provide('', {
   init: function(options) {
     // only need to list values here that do not already have a falsy default.
     // this is why cookie/session/status are not listed here.
-    FB.copy(options, {
+    options = FB.copy(options || {}, {
       logging: true
     });
 

tests/js/debug_logs.js

@@ -79,19 +79,3 @@ test(
     FB._session = oldSession;
   }
 );
-
-test(
-  'FB.init api key',
-
-  function() {
-    expect(1);
-
-    var logCb = function(msg) {
-      ok(msg == 'FB.init() called without an apiKey.',
-         'got the expected log message that the apiKey was not found.');
-    };
-    FB.Event.subscribe('fb.log', logCb);
-    FB.init();
-    FB.Event.unsubscribe('fb.log', logCb);
-  }
-);