chore: run nil check before update

Author: MeanderingProgrammer

doc/render-markdown.txt

@@ -1,4 +1,4 @@
-*render-markdown.txt*         For 0.10.0         Last change: 2024 December 08
+*render-markdown.txt*         For 0.10.0         Last change: 2024 December 09
 
 ==============================================================================
 Table of Contents                          *render-markdown-table-of-contents*

lua/render-markdown/core/util.lua

@@ -32,10 +32,10 @@ end
 ---@param win integer
 ---@return boolean
 function M.valid(buf, win)
-    if buf == nil or not vim.api.nvim_buf_is_valid(buf) then
+    if not vim.api.nvim_buf_is_valid(buf) then
         return false
     end
-    if win == nil or not vim.api.nvim_win_is_valid(win) then
+    if not vim.api.nvim_win_is_valid(win) then
         return false
     end
     return buf == vim.fn.winbufnr(win)

lua/render-markdown/health.lua

@@ -4,7 +4,7 @@ local state = require('render-markdown.state')
 local M = {}
 
 ---@private
-M.version = '7.7.1'
+M.version = '7.7.2'
 
 function M.check()
     M.start('version')

lua/render-markdown/manager.lua

@@ -79,6 +79,9 @@ function M.attach(buf)
             end
             local win, windows = util.current('win'), util.windows(buf)
             win = vim.tbl_contains(windows, win) and win or windows[1]
+            if win == nil then
+                return
+            end
             local event = args.event
             ui.update(buf, win, event, vim.tbl_contains(change_events, event))
         end,