fix iqdb query path error

app/controllers/iqdb_queries_controller.rb

@@ -11,6 +11,8 @@ class IqdbQueriesController < ApplicationController
       create_by_url
     elsif params[:post_id]
       create_by_post
+    else
+      render :nothing => true, :status => 422
     end
   end
 

public/robots.txt

@@ -11,6 +11,7 @@ Disallow: /counts
 Disallow: /delayed_jobs
 Disallow: /dmails
 Disallow: /favorite
+Disallow: /iqdb_queries
 Disallow: /ip_bans
 Disallow: /janitor_trials
 Disallow: /maintenance