Cookies without name should not be discarded

At this point Qt is discarding cookies without name. But other platforms are
not. It would be nice to follow what other platforms are doing.

Here are the quotes from QT and SOUP:

QT 4.7 QNetworkCookie::setName
setting a cookie name to an empty QByteArray will make this cookie invalid.

SOUP SoupCookie
If the cookie is generated from a string that appears to have no name, then
name will be the empty string.