wireguard_mesh: only run batctl commands if there are peers

roles/install_wireguard_mesh/templates/down.sh.j2

@@ -1,6 +1,8 @@
 #!/bin/bash
+{% if item.wireguard_mesh_peers %}
 {% for peer in item.wireguard_mesh_peers %}
 batctl -m bat{{ item.name }} if del mesh{{ item.name }}{{ peer.number }}
 ip link set down dev mesh{{ item.name }}{{ peer.number }}
 ip link del mesh{{ item.name }}{{ peer.number }} type ip6gretap
 {% endfor %}
+{% endif %}

roles/install_wireguard_mesh/templates/up.sh.j2

@@ -1,4 +1,5 @@
 #!/bin/bash
+{% if item.wireguard_mesh_peers %}
 {% for peer in item.wireguard_mesh_peers %}
 ip link add mesh{{ item.name }}{{ peer.number }} type ip6gretap remote {{ peer.address }} local {{ item.wireguard_mesh_address }} ttl 255 dev wg{{ item.name }}
 ip link set mtu 1280 dev mesh{{ item.name }}{{ peer.number }}
@@ -13,3 +14,4 @@ echo 64 > /sys/class/net/bat{{ item.name }}/mesh/hop_penalty
 netctl start bat{{ item.name }}
 systemctl restart dhcpd4.service
 systemctl restart named.service
+{% endif %}