Fix dev proxy fallbacks

dev-proxy/src/docker-gen/templates/Caddyfile.tmpl

@@ -1,18 +1,21 @@
 {{ $CurrentContainer := where $ "ID" .Docker.CurrentContainerID | first }}
 
 {{ $hosts := groupByMulti $ "Env.VIRTUAL_HOST" "," }}
-
-{{ if not $hosts }}
-
-127.0.0.1:80
-log stdout
-errors stderr
-
-{{ else }}
 {
   auto_https disable_redirects
   local_certs
 }
+
+:80 {
+  log {
+   output stdout
+  }
+
+  respond "Site is not registered with proxy."
+}
+
+{{ if $hosts }}
+
   {{ range $host, $containers := $hosts }}
     {{ $c := first $containers }}
     {{ $tlsOff := trim (index $c.Env "VIRTUAL_DISABLE_TLS") }}