From 14dd61fc870ead5fdff887b1cbe876d916a87061 Mon Sep 17 00:00:00 2001
From: Jack Nagel
Date: Sat, 10 Aug 2013 19:56:28 -0500
Subject: Check that the cellar exists in Formula.installed

Fixes Homebrew/homebrew#21741.
---
 Library/Homebrew/formula.rb | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'Library')

diff --git a/Library/Homebrew/formula.rb b/Library/Homebrew/formula.rb
index e44a4cfb0..bb1d91687 100644
--- a/Library/Homebrew/formula.rb
+++ b/Library/Homebrew/formula.rb
@@ -355,6 +355,8 @@ class Formula
   end
 
   def self.installed
+    return [] unless HOMEBREW_CELLAR.directory?
+
     HOMEBREW_CELLAR.children.map do |rack|
       begin
         factory(rack.basename.to_s)
-- 
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