chore: minor cleanup to root_dir comments (#1222)

lua/lsp/null-ls.lua

@@ -24,21 +24,19 @@ function M.get_registered_providers_by_filetype(ft)
 end
 
 local function validate_nodejs_provider(requests, provider)
-  local root_dir = ""
+  local root_dir
   if lvim.builtin.rooter.active then
-    --- old logic to set root_dir
+    --- use vim-rooter to set root_dir
     vim.cmd "let root_dir = FindRootDirectory()"
     root_dir = vim.api.nvim_get_var "root_dir"
   else
-    --- new logic to set root_dir
+    --- use LSP to set root_dir
     local ts_client = require("utils").get_active_client_by_ft "typescript"
-    if ts_client then
-      root_dir = ts_client.config.root_dir
-    end
     if ts_client == nil then
       u.lvim_log "Unable to determine root directory since tsserver didn't start correctly"
       return
     end
+    root_dir = ts_client.config.root_dir
   end
   local local_nodejs_command = root_dir .. "/node_modules/.bin/" .. provider._opts.command
   u.lvim_log(string.format("checking [%s] for local node module: [%s]", local_nodejs_command, vim.inspect(provider)))