Don't send inactive email unless an inactivity time is set

htdocs/auth/lib.php

@@ -1136,6 +1136,7 @@ function auth_handle_account_expiries() {
     }
 
     
+    if ($expire) {
         // Inactivity (lastlogin is too old)
         if ($users = get_records_sql_array('SELECT u.id, u.username, u.firstname, u.lastname, u.preferredname, u.email, u.admin, u.staff
             FROM {usr} u
@@ -1160,6 +1161,7 @@ function auth_handle_account_expiries() {
                 deactivate_user($user->id);
             }
         }
+    }
 
     // Institution membership expiry
     delete_records_sql('DELETE FROM {usr_institution}