[优先工单] 升级到7.12.9后，$keyword=trim($_GET["keyword"]); 出错

升级到7.12.9后，$keyword=trim($_GET["keyword"]);当没有keyword时，出错如下信息：
PHP Notice: Undefined index: typename in D:\wwwroot\bbs\wwwroot\puyuetian\function.php(287) : eval()'d code on line 33
PHP Notice: Undefined index: keyword in D:\wwwroot\bbs\wwwroot\puyuetian\function.php(287) : eval()'d code on line 40
PHP Notice: Undefined index: page in D:\wwwroot\bbs\wwwroot\puyuetian\function.php(287) : eval()'d code on line 41
PHP Notice: Undefined index: O in D:\wwwroot\bbs\wwwroot\puyuetian\function.php(287) : eval()'d code on line 189
PHP Notice: Undefined variable: currentpage in D:\wwwroot\bbs\wwwroot\puyuetian\function.php(287) : eval()'d code on line 356
PHP Notice: Undefined variable: totalput in D:\wwwroot\bbs\wwwroot\puyuetian\function.php(287) : eval()'d code on line 362
PHP Notice: Use of undefined constant MaxPerPage - assumed 'MaxPerPage' in D:\wwwroot\bbs\wwwroot\puyuetian\function.php(287) : eval()'d code on line 386
PHP Notice: Undefined variable: zxhfhtml11 in D:\wwwroot\bbs\wwwroot\puyuetian\function.php(287) : eval()'d code on line 92
PHP Notice: Undefined index: HTMLCODE in D:\wwwroot\bbs\wwwroot\app\fz_download\index.php on line 7
PHP Notice: Undefined index: OUTPUT in D:\wwwroot\bbs\wwwroot\app\fz_download\index.php on line 7
PHP Notice: Undefined index: PHPCACHE_OPEN in D:\wwwroot\bbs\wwwroot\puyuetian\function.php on line 211
PHP Notice: Undefined index: w in D:\wwwroot\bbs\wwwroot\puyuetian\function.php(334) : eval()'d code on line 1
PHP Notice: Undefined index: MAIN in D:\wwwroot\bbs\wwwroot\puyuetian\output.php on line 6
PHP Notice: Undefined index: PHPCACHE_OPEN in D:\wwwroot\bbs\wwwroot\puyuetian\function.php on line 211
PHP Notice: Undefined index: PHPCACHE_OPEN in D:\wwwroot\bbs\wwwroot\puyuetian\function.php on line 211
PHP Notice: Undefined index: PHPCACHE_OPEN in D:\wwwroot\bbs\wwwroot\puyuetian\function.php on line 211
PHP Notice: Undefined index: GLOBALCDN in D:\wwwroot\bbs\wwwroot\template\default\phpscript\main.php on line 6
PHP Notice: Undefined index: CACHE in D:\wwwroot\bbs\wwwroot\puyuetian\output.php on line 13
PHP Notice: Undefined index: FOFS in D:\wwwroot\bbs\wwwroot\puyuetian\function.php on line 1184

如$cName=trim($_GET["cName"]);,只要没有cName，也会出错，
怎么处理这个问题？