fix error "undefined method map for nil:NilClass"

app/controllers/platforms/mass_builds_controller.rb

@@ -42,12 +42,15 @@ class Platforms::MassBuildsController < Platforms::BaseController
   end
 
   def index
-    if request.xhr?
+    respond_to do |format|
+      format.html {}
+      format.json {
         @mass_builds        = @platform.mass_builds
         @total_mass_builds  = @mass_builds.count
         @mass_builds        = @mass_builds.order("id #{sort_dir}")
-      @mass_builds        = @mass_builds.search(params[:sSearch]).
-                              paginate(page: page, per_page: per_page)
+                                .search(params[:sSearch])
+                                .paginate(page: page, per_page: per_page)
+      }
     end
   end