fix(informer): 🥅 make player undefined if nul

This allows to fallback to defaults in functions

lib/plugins/informer.js

@@ -153,6 +153,8 @@ function command(message_parts, player) {
     if (message_parts.length > 0) {
         cfg.info.recentCommand = message_parts
     }
+    if (player === null)
+        player = void 0
     switch (message_parts.length) {
         case 0:
             if (cfg.info.recentCommand) {