Don't write receipt for empty installs

Fixes Homebrew/homebrew#8616.

1 files changed, 1 insertions, 1 deletions

diff --git a/Library/Homebrew/formula_installer.rb b/Library/Homebrew/formula_installer.rb
index 97292d984..1a4250486 100644
--- a/Library/Homebrew/formula_installer.rb
+++ b/Library/Homebrew/formula_installer.rb
@@ -131,7 +131,7 @@ class FormulaInstaller
       raise "Suspicious installation failure" unless $?.success?
 
       # Write an installation receipt (a Tab) to the prefix
-      Tab.for_install(f, args).write
+      Tab.for_install(f, args).write if f.prefix.exist?
     end
   end