Fix dmail failures when akismet isn't configured.

app/models/dmail.rb

@@ -30,6 +30,12 @@ class Dmail < ApplicationRecord
     def creator_ip_addr_str
       creator_ip_addr.to_s
     end
+
+    def spam?(sender = CurrentUser.user)
+      return false if Danbooru.config.rakismet_key.blank?
+      return false if sender.is_gold?
+      super()
+    end
   end
 
   module AddressMethods
@@ -52,12 +58,7 @@ class Dmail < ApplicationRecord
     def initialize_attributes
       self.from_id ||= CurrentUser.id
       self.creator_ip_addr ||= CurrentUser.ip_addr
-      if CurrentUser.is_gold?
-        self.is_spam = false
-      else
-        self.is_spam = spam?
-      end
-      true
+      self.is_spam = spam?(CurrentUser.user)
     end
   end
 

config/application.rb

@@ -30,11 +30,6 @@ module Danbooru
       config.x.git_hash = nil
     end
 
-    if ENV["DANBOORU_RAKISMET_KEY"]
-      config.rakismet.key = ENV["DANBOORU_RAKISMET_KEY"]
-      config.rakismet.url = ENV["DANBOORU_RAKISMET_URL"]
-    end
-
     config.after_initialize do
       Rails.application.routes.default_url_options = {
         host: Danbooru.config.hostname,

config/danbooru_default_config.rb

@@ -619,6 +619,13 @@ module Danbooru
 
     def aws_sqs_cropper_url
     end
+
+    # Akismet API key. Used for Dmail spam detection. http://akismet.com/signup/
+    def rakismet_key
+    end
+
+    def rakismet_url
+    end
   end
 
   class EnvironmentConfiguration

config/initializers/rakismet.rb

@@ -0,0 +1,2 @@
+Rails.application.config.rakismet.key = Danbooru.config.rakismet_key
+Rails.application.config.rakismet.url = Danbooru.config.rakismet_url