From 4dccc2ef7f48e25a90a64701531bc88f2ffa31ef Mon Sep 17 00:00:00 2001
From: Carlo Cabrera <30379873+carlocab@users.noreply.github.com>
Date: Mon, 22 Mar 2021 17:15:56 +0000
Subject: [PATCH] cmd/list: list formulae only if one is installed

We need the `HOMEBREW_CELLAR.exist?` check to avoid errors in new
installations, which may not have a `Cellar` directory.
---
 Library/Homebrew/cmd/list.rb | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/Library/Homebrew/cmd/list.rb b/Library/Homebrew/cmd/list.rb
index 52f853ea66..6d05addb80 100644
--- a/Library/Homebrew/cmd/list.rb
+++ b/Library/Homebrew/cmd/list.rb
@@ -116,8 +116,10 @@ module Homebrew
       ls_args << "-r" if args.r?
       ls_args << "-t" if args.t?
 
-      ohai "Formulae" if $stdout.tty? && !args.formula?
-      safe_system "ls", *ls_args, HOMEBREW_CELLAR
+      if HOMEBREW_CELLAR.exist? && HOMEBREW_CELLAR.children.any?
+        ohai "Formulae" if $stdout.tty? && !args.formula?
+        safe_system "ls", *ls_args, HOMEBREW_CELLAR
+      end
 
       if !args.formula? && Cask::Caskroom.casks.any?
         if $stdout.tty?