Fixes #55476 (#57715)

* fixes bug introduced by commit 8cb73720f0599b08794cb7a3fbdf36d430214446: "TypeError: argument of type 'NoneType' is not iterable" when using module systemd without param 'name' (e.g. with daemon_reload)

lib/ansible/modules/system/systemd.py

@@ -341,6 +341,7 @@ def main():
     )
 
     unit = module.params['name']
+    if unit is not None:
         for globpattern in (r"*", r"?", r"["):
             if globpattern in unit:
                 module.fail_json(msg="This module does not currently support using glob patterns, found '%s' in service name: %s" % (globpattern, unit))