Fix bug.

app/models/ad_image.rb

@@ -91,9 +91,17 @@ class AdImage
   def embed_url
     uri = URI.parse(self.youtube) rescue nil
     if !uri.nil? && uri.host == "www.youtube.com"
-      params = CGI.parse(uri.query)
-      v = params['v'].first
+      if uri.path.start_with?('/embed/')
+        return self.youtube.sub(/http(s|):\/\//,'//')
+      else
+        params = CGI.parse(uri.query.to_s)
+        v = params.blank? ? nil : params['v'].first
+        if v.blank?
+          return ""
+        else
           return "//www.youtube.com/embed/#{v}"
+        end
+      end
     else
       return ""
     end