From fd5352b0c606fee92e296cf1908301041e52eaa0 Mon Sep 17 00:00:00 2001
From: Emile Vauge <emile@vauge.com>
Date: Wed, 22 Jun 2016 22:07:02 +0200
Subject: [PATCH] Fix empty rule

Signed-off-by: Emile Vauge <emile@vauge.com>
---
 rules.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/rules.go b/rules.go
index 229f58203..f0c03409d 100644
--- a/rules.go
+++ b/rules.go
@@ -106,6 +106,11 @@ func (r *Rules) Parse(expression string) (*mux.Route, error) {
 		"Headers":         r.headers,
 		"HeadersRegexp":   r.headersRegexp,
 	}
+
+	if len(expression) == 0 {
+		return nil, errors.New("Empty rule")
+	}
+
 	f := func(c rune) bool {
 		return c == ':'
 	}