fix: no fallar si no hay sitio del panel

app/controllers/env_controller.rb

@@ -5,6 +5,7 @@ class EnvController < ActionController::Base
 
   def index
     @site = Site.find_by_name('panel')
-    stale? @site
+
+    stale? @site if @site
   end
 end

app/views/env/index.js.haml

@@ -1,7 +1,8 @@
-= cache @site do
-  :plain
-    window.env = {
-      AIRBRAKE_SITE_ID: #{@site.id},
-      AIRBRAKE_API_KEY: "#{@site.airbrake_api_key}",
-      PANEL_URL: "#{ENV['PANEL_URL']}"
-    }
+- if @site
+  = cache @site do
+    :plain
+      window.env = {
+        AIRBRAKE_SITE_ID: #{@site.id},
+        AIRBRAKE_API_KEY: "#{@site.airbrake_api_key}",
+        PANEL_URL: "#{ENV['PANEL_URL']}"
+      }