Merge branch 'nd/worktree-remove-with-uninitialized-submodules'

"git worktree remove" and "git worktree move" refused to work when there is a submodule involved. This has been loosened to ignore uninitialized submodules. * nd/worktree-remove-with-uninitialized-submodules: worktree: allow to (re)move worktrees with uninitialized submodules