Fix missing at sign in template

recipes/configure-engage-nginx-proxy.rb

@@ -15,10 +15,7 @@
 # Escape the 2 dots to use as literal dot chars in regex
 engage_domain_cors_regex = public_engage_hostname_cors[/((?=.)(\w+))((?:.)(\w+)){2}\z/].gsub(/\./, "\\.")
 
-# This is because I thought the join was the problem when doing it in the template variables below
-iframe_embed_whitelist_array = get_iframe_embed_allowed_hosts
-# Trying to force set iframe_embed_whitelist to something, the get should have saved it to []
-iframe_embed_whitelist = iframe_embed_whitelist_array.join(" ") ? iframe_embed_whitelist_array.join(" ") : []
+iframe_embed_whitelist = get_iframe_embed_allowed_hosts
 
 ssl_info = node.fetch(:ssl, get_dummy_cert)
 if cert_defined(ssl_info)
@@ -53,7 +50,7 @@
     certificate_exists: certificate_exists,
     public_engage_hostname: public_engage_hostname,
     engage_domain_cors_regex: engage_domain_cors_regex,
-    iframe_embed_whitelist: iframe_embed_whitelist
+    iframe_embed_whitelist: iframe_embed_whitelist.join(" ")
   })
 end
 

templates/default/engage-nginx-proxy-conf.erb

@@ -142,7 +142,7 @@ server {
   add_header Access-Control-Allow-Methods     $cors_method	always;
   add_header Vary                             $cors_vary	always;
   add_header Access-Control-Expose-Headers    $cors_expose_headers always;
-  add_header Content-Security-Policy "frame-ancestors 'self' <%= iframe_embed_whitelist %>;";
+  add_header Content-Security-Policy "frame-ancestors 'self' <%= @iframe_embed_whitelist %>;";
   # -- End cors specific headers (nginx omits headers with empty value )-- #
 
   location /static {