Merge pull request #2489 from joelittlejohn/patch-1

Avoid using Facebook garbage fragment to complete login

src/main/html/o2c.html

@@ -1,6 +1,6 @@
 <script>
 var qp = null;
-if(window.location.hash) {
+if(window.location.hash && window.location.hash !== "#_=_") {
   qp = location.hash.substring(1);
 }
 else {
@@ -17,4 +17,4 @@ else
     window.opener.onOAuthComplete(qp);
 
 window.close();
-</script>
+</script>