additional fixes for install script

config/initializers/z_dalli.rb

@@ -2,6 +2,21 @@ unless defined?(MEMCACHE)
   MEMCACHE = Dalli::Client.new(Danbooru.config.memcached_servers, :namespace => Danbooru.config.app_name.gsub(/[^A-Za-z0-9]/, "_"))
 end
 
+begin
+  MEMCACHE.get("x")
+rescue Dalli::RingError => e
+  puts "-" * 40
+  puts "WARNING! MEMCACHE SERVER NOT FOUND! You will experience performance degradation."
+  puts e.to_s
+  puts "-- BEGIN STACKTRACE --"
+  e.backtrace.each do |line|
+    puts line
+  end
+  puts "-- END STACKTRACE --"
+  puts "-" * 40
+  MEMCACHE = MemcacheMock.new
+end
+
 if Rails.env.production?
   Rails.application.configure do
     config.cache_store = :dalli_store, Danbooru.config.memcached_servers