autocommand: Fix unmap function to check if the keymap exists before deleting

lua/autocommands.lua

@@ -1,5 +1,12 @@
 local markdown = vim.api.nvim_create_augroup("markdown", { clear = true })
 
+local keyunmap = function(mode, binding)
+  print(vim.inspect(vim.fn.maparg(binding, mode)))
+  if vim.fn.maparg(binding, mode) ~= "" then
+    vim.keymap.del(mode, binding)
+  end
+end
+
 -- Recognize .md as pandoc
 vim.api.nvim_create_autocmd({"BufEnter", "BufWinEnter"}, {
   pattern = {"*.md", },
@@ -34,8 +41,8 @@ vim.api.nvim_create_autocmd({"OptionSet"}, {
       vim.keymap.set("n", "<Leader>i", "mz[s1z=`z", {noremap = true, silent = true})
       vim.keymap.set("n", "à", "]s", {noremap = true, silent = true})
     else
-      vim.keymap.del("n", "<Leader>i")
-      vim.keymap.del("n", "à")
+      keyunmap("n", "<Leader>i")
+      keyunmap("n", "à")
     end
   end
 })