Fix reading of redis namespace from config

Changed default to nil to not screw users running develop already

config/defaults.yml

@@ -13,7 +13,7 @@ defaults:
     require_ssl: true
     single_process_mode: false
     sidekiq:
-      namespace: "diaspora"
+      namespace:
       concurrency: 5
       retry: 10
       backtrace: 15

lib/configuration_methods.rb

@@ -93,7 +93,7 @@ module Configuration
         redis_options[:url] = redis_url
       end
       
-      redis_options[:namespace] = AppConfig.environment.sidekiq_namespace.get
+      redis_options[:namespace] = AppConfig.environment.sidekiq.namespace.get
       
       redis_options
     end