[bundler/bundler] Move local variable to only branch where it's used

https://github.com/bundler/bundler/commit/3995b3345d

lib/bundler/cli/open.rb

@@ -14,10 +14,10 @@ module Bundler
       editor = [ENV["BUNDLER_EDITOR"], ENV["VISUAL"], ENV["EDITOR"]].find {|e| !e.nil? && !e.empty? }
       return Bundler.ui.info("To open a bundled gem, set $EDITOR or $BUNDLER_EDITOR") unless editor
       return unless spec = Bundler::CLI::Common.select_spec(name, :regex_match)
-      path = spec.full_gem_path
       if spec.default_gem?
         Bundler.ui.info "Unable to open #{name} because it's a default gem, so the directory it would normally be installed to does not exist."
       else
+        path = spec.full_gem_path
         Dir.chdir(path) do
           command = Shellwords.split(editor) + [path]
           Bundler.with_original_env do