use default case in Request::defineMethod

[hutnikau]

i found a lot of such notices in the log:

{
    "level": "proxy_fcgi:error",
    "pid": "24787:tid 140692986652416",
    "client": "132.232.200.142:40144",
    "message": "AH01071: Got error 'PHP message: PHP Notice:  Undefined variable: method in /var/www/html/tao/vendor/clearfw/clearfw/core/Request.class.php on line 266\\nPHP message: PHP Notice:  Undefined variable: method in /var/www/html/tao/vendor/clearfw/clearfw/core/Request.class.php on line 266\\n'",
    "instance_id": "i-029f2b5596a987341",
    "stack": "usact02dep",
    "host_type": "taocloud/ws/delivery"
}