Fix runtime menu refresh crash when application menus are not yet received (#9762)

docs/en_US/release_notes_9_16.rst

@@ -42,6 +42,7 @@ Bug fixes
   | `Issue #6308 <https://github.com/pgadmin-org/pgadmin4/issues/6308>`_ -  Fix the infinite loading spinner after an idle database connection is silently dropped, by detecting stale connections and offering a reconnect dialog.
   | `Issue #9595 <https://github.com/pgadmin-org/pgadmin4/issues/9595>`_ -  Fix missing ALTER ... SET DEFAULT statements for inherited columns in the generated table SQL/EDIT script.
   | `Issue #9677 <https://github.com/pgadmin-org/pgadmin4/issues/9677>`_ -  Fix the Unlogged table toggle in table properties not generating any ALTER TABLE ... SET LOGGED/UNLOGGED statement.
+  | `Issue #9762 <https://github.com/pgadmin-org/pgadmin4/issues/9762>`_ -  Fix the "Cannot read properties of undefined (reading 'map')" crash in the desktop runtime when a menu refresh is triggered before the application menus have been received.
   | `Issue #9828 <https://github.com/pgadmin-org/pgadmin4/issues/9828>`_ -  Fix tool calls failing against OpenAI-compatible providers that emit empty/null name, arguments, or id fields in streaming continuation deltas.
   | `Issue #9875 <https://github.com/pgadmin-org/pgadmin4/issues/9875>`_ -  Fixed an issue where EXPLAIN and EXPLAIN ANALYZE failed to execute when blank lines separated clauses in the SQL query.
   | `Issue #9810 <https://github.com/pgadmin-org/pgadmin4/issues/9810>`_ -  Use the ServerManager's passfile for the credential gate in connect() so the check matches the passfile actually used for the connection, and warn on conflicting passfile/passexec settings.

runtime/src/js/menu.js

@@ -190,6 +190,12 @@ function buildAndSetMenus(menus, pgAdminMainScreen, configStore, callbacks={}) {
 }
 
 export function refreshMenus(pgAdminMainScreen, configStore, callbacks={}) {
+  // cachedMenus is only populated once the renderer sends its menu definition
+  // via the 'setMenus' IPC. A refresh can be triggered before that happens
+  // (e.g. an auto-update event, or the window being closed while the UI is
+  // still loading). In that case there are no menus to rebuild, so bail out
+  // to avoid dereferencing an undefined menu list.
+  if (!cachedMenus) return;
   buildAndSetMenus(cachedMenus, pgAdminMainScreen, configStore, callbacks);
 }