bottle: use if-else branch instead of exit

Library/Homebrew/cmd/bottle.rb

@@ -278,14 +278,15 @@ module Homebrew
         end
       end
     end
-    exit 0
   end
 
   def bottle
-    merge if ARGV.include? "--merge"
+    if ARGV.include? "--merge"
-
+      merge
+    else
       ARGV.resolved_formulae.each do |f|
         bottle_formula f
       end
     end
+  end
 end