Add default config for keyword policy

config/config.exs

@@ -238,6 +238,11 @@
   reject: [],
   accept: []
 
+config :pleroma, :mrf_keyword,
+  reject: [],
+  ftl_removal: [],
+  replace: []
+
 config :pleroma, :rich_media, enabled: true
 
 config :pleroma, :media_proxy,

lib/pleroma/web/nodeinfo/nodeinfo_controller.ex

@@ -46,7 +46,7 @@ def raw_nodeinfo() do
 
     # This horror is needed to convert regex sigils to strings
     mrf_keyword =
-      Application.get_env(:pleroma, :mrf_keyword)
+      Application.get_env(:pleroma, :mrf_keyword, [])
       |> Enum.map(fn {key, value} ->
         {key,
          Enum.map(value, fn