fix: harden git status updates (#2533)

* fix for nil status error messages

* simplify logic

---------

Co-authored-by: Alexander Courtis <alex@courtis.org>

lua/nvim-tree/explorer/node.lua

@@ -14,6 +14,7 @@ local function get_dir_git_status(parent_ignored, status, absolute_path)
     return { file = "!!" }
   end
 
+  if status then
     return {
       file = status.files and status.files[absolute_path],
       dir = status.dirs and {
@@ -21,6 +22,7 @@ local function get_dir_git_status(parent_ignored, status, absolute_path)
         indirect = status.dirs.indirect[absolute_path],
       },
     }
+  end
 end
 
 local function get_git_status(parent_ignored, status, absolute_path)