BUG: Uncaught exceptions when interacting with blank line

[FalcoGer]

Did you check docs and existing issues?

• I have read all the docs.
• I have searched the existing issues.
• I have searched the existing discussions.

Neovim Version (nvim -v)

NVIM v0.10.0-dev-e59cf3b3a

Operating System / Version

Ubuntu Mate 22.04

Describe the Bug

When add_blank_line_at_top = true a blank line is inserted at the top of the tree. When interacting with this blank like, for example using open or toggle, an exception is thrown.

Screenshots, Traceback

E5108: Error executing lua: ...d/neo-tree.nvim/lua/neo-tree/sources/common/commands.lua:682: attempt to index local 'node' (a nil value)
stack traceback:
...d/neo-tree.nvim/lua/neo-tree/sources/common/commands.lua:682: in function 'open_with_cmd'
...d/neo-tree.nvim/lua/neo-tree/sources/common/commands.lua:741: in function 'open'
...o-tree.nvim/lua/neo-tree/sources/filesystem/commands.lua:184: in function <...o-tree.nvim/lua/neo-tree/sources/filesystem/commands.lua:183>

Steps to Reproduce

1. Enable add_blank_line_at_top
2. Open :Neotree
3. Navigate to the blank line
4. Hit

Expected Behavior

Nothing should happen

Your Configuration

-- DO NOT change the paths and don't remove the colorscheme
local root = vim.fn.fnamemodify("./.repro", ":p")

-- set stdpaths to use .repro
for _, name in ipairs({ "config", "data", "state", "cache" }) do
  vim.env[("XDG_%s_HOME"):format(name:upper())] = root .. "/" .. name
end

-- bootstrap lazy
local lazypath = root .. "/plugins/lazy.nvim"
if not vim.loop.fs_stat(lazypath) then
  vim.fn.system({ "git", "clone", "--filter=blob:none", "https://github.com/folke/lazy.nvim.git", lazypath, })
end
vim.opt.runtimepath:prepend(lazypath)

-- install plugins
local plugins = {
  "folke/tokyonight.nvim",
  -- add any other plugins here
}

local neotree_config = {
  "nvim-neo-tree/neo-tree.nvim",
  dependencies = { "MunifTanjim/nui.nvim", "nvim-tree/nvim-web-devicons", "nvim-lua/plenary.nvim" },
  cmd = { "Neotree" },
  keys = {
    { "<Leader>e", "<Cmd>Neotree<CR>" }, -- change or remove this line if relevant.
  },
  opts = {
    add_blank_line_at_top = true,
    -- ...
  },
}

table.insert(plugins, neotree_config)
require("lazy").setup(plugins, {
  root = root .. "/plugins",
})

vim.cmd.colorscheme("tokyonight")
-- add anything else here

[pysan3]

Just to inform you, this will be fixed with

• refactor(type): add type annotation for defaults.lua #1333

which will take pretty long tho.

Please be careful not to hit an empty line is all I can say for now lol.
That empty head line option was added relatively recently and some parts of the code still assume that there is definitely a node for each line.