Call path_to_repo only when using gitaly

lib/backup/repository.rb

@@ -99,7 +99,6 @@ module Backup
       Project.find_each(batch_size: 1000) do |project|
         progress.print " * #{project.full_path} ... "
         path_to_project_bundle = path_to_bundle(project)
-        path_to_project_repo = path_to_repo(project)
         project.ensure_storage_path_exists
 
         restore_repo_success = nil
@@ -127,6 +126,7 @@ module Backup
           # Gitaly migration issue: https://gitlab.com/gitlab-org/gitaly/issues/1195
           unless is_enabled
             in_path(path_to_tars(project)) do |dir|
+              path_to_project_repo = path_to_repo(project)
               cmd = %W(tar -xf #{path_to_tars(project, dir)} -C #{path_to_project_repo} #{dir})
 
               output, status = Gitlab::Popen.popen(cmd)