fix: conditional error when no seed exists

In situations where there is no `seed` the `seed-hypervisor` will fail a 
host configure against `no_proxy` settings due to the conditional 
attempting to access attributes that do not exist.

etc/kayobe/inventory/group_vars/seed-hypervisor/proxy.yml

@@ -0,0 +1,22 @@
+---
+###############################################################################
+# Configuration of HTTP(S) proxies.
+
+# HTTP proxy URL (format: http(s)://[user:password@]proxy_name:port). By
+# default no proxy is used.
+#http_proxy:
+
+# HTTPS proxy URL (format: http(s)://[user:password@]proxy_name:port). By
+# default no proxy is used.
+#https_proxy:
+
+# List of domains, hostnames, IP addresses and networks for which no proxy is
+# used. Defaults to ["127.0.0.1", "localhost", "{{ ('http://' ~
+# docker_registry) | urlsplit('hostname') }}"] if docker_registry is set, or
+# ["127.0.0.1", "localhost"] otherwise. This is configured only if either
+# http_proxy or https_proxy is set.
+no_proxy: []
+
+###############################################################################
+# Dummy variable to allow Ansible to accept this file.
+workaround_ansible_issue_8743: yes