From 51a6c8beba264d5dcf40841615db88fa19c8fa2e Mon Sep 17 00:00:00 2001
From: gorhill <rhill@raymondhill.net>
Date: Fri, 13 Feb 2015 18:59:51 -0500
Subject: [PATCH] trivial test to workaround potential bad filters

---
 src/js/static-net-filtering.js | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/js/static-net-filtering.js b/src/js/static-net-filtering.js
index b22cd0a59..4958bbb6f 100644
--- a/src/js/static-net-filtering.js
+++ b/src/js/static-net-filtering.js
@@ -1538,6 +1538,12 @@ FilterParser.prototype.parse = function(s) {
         s = trimChar(s, '*');
     }
 
+    // nothing left?
+    if ( s === '' ) {
+        this.unsupported = true;
+        return this;
+    }
+
     // plain hostname?
     this.hostnamePure = this.hostnameAnchored && reHostnameRule.test(s);