models/network: don't render wifi devices that have no addresses and no DHCP.
models/network: don't render wifi devices that have no addresses and no DHCP.

Otherwise netplan, seeing the device half-rendered, also expects to set a
SSID we haven't set.

Signed-off-by: Mathieu Trudel-Lapierre <bab670cc3de8a930dbcc4c98df4e7a8fdd9221c3@canonical.com>

CanonicalLtd/subiquity,CanonicalLtd/subiquity