When a user has no password and a polkit authentication is started,
instead of blindly initiating the admin session, the regular
"Authentication Requested" dialog is shown (but without the password
entry). This means that the user's admin session is only effectively
started after the user chooses to proceed with the authentication which
provides an extra confirmation step that can be vital for critical
tasks.
Ideally we should use a different wording than "authentication" when the
user has no password set, and use "confirmation" instead. However polkit
already sends the requests with such messages (e.g. "Authentication is
required to configure software repositories"), and it's important to
show those to the user, so this patch keeps the regular wording.
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