Fix crash when client talks with unknowm protocol
Fix crash when client talks with unknowm protocol

Change-Id: Ie8901c84bcd3c96052c3fc2bf244a1f646b6c0f7
Reviewed-on: http://codereview.qt-users.jp/1044
Reviewed-by: <42980d970444f9101663582e70cd53623b3238b4@gmail.com>
Tested-by: <42980d970444f9101663582e70cd53623b3238b4@gmail.com>

qt-users-jp/qthttpserver,qt-users-jp/qthttpserver