Don't error when there are no discussions

lua/gitlab/discussions.lua

@@ -55,6 +55,10 @@ M.list_discussions = function()
     args = { "listDiscussions", state.PROJECT_ID },
     on_stdout = function(_, line)
       local discussions = vim.json.decode(line)
+      if (type(discussions) == 'userdata') then
+        notify("No discussions found for this MR", "warn")
+        return
+      end
       M.discussions = discussions
       vim.schedule(function()
         vim.cmd.tabnew()
@@ -62,9 +66,6 @@ M.list_discussions = function()
         vim.api.nvim_command("vsplit")
         vim.api.nvim_buf_set_option(buf, 'filetype', 'markdown')
         vim.api.nvim_set_current_buf(buf)
-        if discussions == nil then
-          notify("No discussions found for this MR", "warn")
-        else
         local allDiscussions = {}
         for i, discussion in ipairs(discussions) do
           local discussionChildren = {}
@@ -93,10 +94,7 @@ M.list_discussions = function()
         state.tree:render()
         vim.api.nvim_buf_set_option(buf, 'filetype', 'markdown')
         u.darken_metadata(buf, '')
-          if not is_refresh then
         M.jump_to_file()
-          end
-        end
       end)
     end,
     on_stderr = u.print_error,