From 13e3f704c93f77ae3f356096bae18c951ce11f87 Mon Sep 17 00:00:00 2001
From: Sam Ford <1584702+samford@users.noreply.github.com>
Date: Wed, 17 Mar 2021 13:25:29 -0400
Subject: [PATCH] Cask::Audit: Account for nil appcast_contents

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

diff --git a/Library/Homebrew/cask/audit.rb b/Library/Homebrew/cask/audit.rb
index 629573079a..69faa8f2b9 100644
--- a/Library/Homebrew/cask/audit.rb
+++ b/Library/Homebrew/cask/audit.rb
@@ -603,7 +603,8 @@ module Cask
 
       version_stanza = cask.version.to_s
       adjusted_version_stanza = cask.appcast.must_contain.presence || version_stanza.match(/^[[:alnum:].]+/)[0]
-      return if appcast_contents.include? adjusted_version_stanza
+      return if appcast_contents.blank?
+      return if appcast_contents.include?(adjusted_version_stanza)
 
       add_error <<~EOS.chomp
         appcast at URL '#{Formatter.url(appcast_url)}' does not contain \