fix: skip normalizing empty file paths (#1363)

Author: bwpge

lua/neo-tree/sources/filesystem/init.lua

@@ -30,7 +30,7 @@ local follow_internal = function(callback, force_show, async)
   if vim.bo.filetype == "neo-tree" or vim.bo.filetype == "neo-tree-popup" then
     return false
   end
-  local path_to_reveal = utils.normalize_path(manager.get_path_to_reveal())
+  local path_to_reveal = utils.normalize_path(manager.get_path_to_reveal() or "")
   if not utils.truthy(path_to_reveal) then
     return false
   end