fix: don't create empty extra command files

lua/auto-session/init.lua

@@ -344,7 +344,7 @@ end
 ---@private
 ---Get the hook commands from the config and run them
 ---@param hook_name string
----@return table Results of the commands
+---@return table|nil Results of the commands
 function AutoSession.run_cmds(hook_name)
   local cmds = Config[hook_name .. "_cmds"]
   return Lib.run_hook_cmds(cmds, hook_name)

lua/auto-session/lib.lua

@@ -536,13 +536,13 @@ end
 
 ---@param cmds table Cmds to run
 ---@param hook_name string Name of the hook being run
----@return table Results of the cmds
+---@return table|nil Results of the cmds
 function Lib.run_hook_cmds(cmds, hook_name)
-  local results = {}
   if Lib.is_empty_table(cmds) then
-    return results
+    return nil
   end
 
+  local results = {}
   for _, cmd in ipairs(cmds) do
     Lib.logger.debug(string.format("Running %s command: %s", hook_name, cmd))
     local success, result

tests/cmds_spec.lua

@@ -30,6 +30,10 @@ describe("The default config", function()
     -- Make sure the session has our buffer
     TL.assertSessionHasFile(TL.default_session_path, TL.test_file)
     assert.True(as.session_exists_for_cwd())
+
+    -- Make sure there isn't an extra commands file by default
+    local default_extra_cmds_path = TL.default_session_path:gsub("%.vim$", "x.vim")
+    assert.equals(0, vim.fn.filereadable(default_extra_cmds_path))
   end)
 
   it("can restore a session for the cwd", function()