fix(registry): use YAML's nil type

Matthew Fisher · Matthew Fisher · commit 9bf5e8e5a5b3 · 2014-10-09T13:46:33.000-06:00
diff --git a/registry/templates/config.yml b/registry/templates/config.yml
@@ -26,8 +26,8 @@ common: &common
         tags_cache_ttl: _env:MIRROR_TAGS_CACHE_TTL:172800 # seconds
 
     cache:
-        host: {{ .deis_cache_host }}
-        port: {{ .deis_cache_port }}
+        host: {{ or (.deis_cache_host) "~" }}
+        port: {{ or (.deis_cache_port) "~" }}
         password: _env:CACHE_REDIS_PASSWORD
         db: 1
 
