From 41b9734dc042efe08c17bbc92992b3be3fc9e7a3 Mon Sep 17 00:00:00 2001
From: Jack Nagel
Date: Tue, 16 Apr 2013 14:18:07 -0500
Subject: Only dup and shift when specs hash is populated

---
 Library/Homebrew/download_strategy.rb | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'Library')

diff --git a/Library/Homebrew/download_strategy.rb b/Library/Homebrew/download_strategy.rb
index 9d6ebb931..17931f21d 100644
--- a/Library/Homebrew/download_strategy.rb
+++ b/Library/Homebrew/download_strategy.rb
@@ -4,7 +4,8 @@ require 'vendor/multi_json'
 class AbstractDownloadStrategy
   def initialize name, package
     @url = package.url
-    @spec, @ref = package.specs.dup.shift
+    specs = package.specs
+    @spec, @ref = specs.dup.shift unless specs.empty?
   end
 
   def expand_safe_system_args args
-- 
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