add exception for direct links to pixiv fanbox images

app/logical/pixiv_api_client.rb

@@ -148,7 +148,11 @@ class PixivApiClient
     end
 
     def pages
-      json["body"]["body"]["images"].map {|x| x["originalUrl"]}
+      if json["body"]["body"]
+        json["body"]["body"]["images"].map {|x| x["originalUrl"]}
+      else
+        []
+      end
     end
   end
 

app/logical/sources/strategies/pixiv.rb

@@ -180,10 +180,13 @@ module Sources
     public
 
       def image_urls_sub
+        if url =~ FANBOX_IMAGE
+          return [url]
+        end
+
         # there's too much normalization bullshit we have to deal with
         # raw urls, so just fetch the canonical url from the api every
         # time.
-
         if manga_page.present?
           return [metadata.pages[manga_page]]
         end