Error when current directory contains invalid symbolic links

[Frederick888]

Noticed a minor issue. When there are any invalid symbolic links, nvim-tree bumps into the following error:

Error executing vim.schedule lua callback: ...zhang/.vim/plugged/nvim-tree.lua/lua/nvim-tree/utils.lua:49: attempt to index local 'path' (a nil value)

To reproduce this issue, for example:

mkdir test
cd !$
touch README.md
ln -s ./nonexist ./foo
nvim README.md

Thanks for this plugin btw :)

[sansone931]

I also noticed this after updating. Changing the current directory with <C-]> to one with a broken symlink doesn't refresh the tree correctly either.

It looks like this commit introduces the problem: db9e70f

[smartding]

It looks like this commit introduces the problem: db9e70f

sorry, didn't check for broken links.