networkd: allow network configuration without address

networkd/templates/20-wired-routed.network.j2

@@ -9,6 +9,7 @@ Name={{ network.interfaces|default([network.interface])|join(' ') }}
 {% for addr in network.addresses|default([network.address]) %}
 Address={{ addr }}
 {% endfor %}
+{% endif %}
 {% for server in network.nameservers|default(nameservers) %}
 DNS={{ server }}
 {% endfor %}
@@ -18,7 +19,6 @@ IPForward=yes
 {% for key, value in (network.settings|default({})).items() %}
 {{ key }}={{ value }}
 {% endfor %}
-{% endif %}
 
 {% for route in network.routes|default([{'gateway': network.gateway}]) %}
 [Route]