fixed fileset title issue

hyrax/app/models/file_set_fast_load_metadata.rb

 class FileSetFastLoadMetadata < ActiveRecord::Base
   scope :sort_and_filter_by_title_and_source, ->(work_source_identifier) {
-    where(work_source_identifier: work_source_identifier)
+    where(work_source_identifier: work_source_identifier).where.not(file_set_title: nil)
     .sort_by { |item| item.file_set_title.to_s.downcase.gsub(/[^a-zA-Z0-9]/, '0').split(/(\d+)/).map { |s| s.match(/\d+/) ? s.to_i : s } }
   }
 end
\ No newline at end of file

hyrax/app/presenters/hyrax/crc_dataset_presenter.rb

@@ -48,8 +48,10 @@ module Hyrax
         if member.class.name == "FileSetFastLoadMetadata"
           # When the data has not been processed by the actors, 
           # the label property is missing and it throws http errors
-          data['info'][member.fedora_file_set_id] = {'title' => member.file_set_title, 'label' => member.file_set_title}
-          data['files'] << member.fedora_file_set_id
+          if member.file_set_title
+            data['info'][member.fedora_file_set_id] = {'title' => member.file_set_title, 'label' => member.file_set_title}
+            data['files'] << member.fedora_file_set_id
+          end
         else
           if member.is_a?(ComplexSubject)
             data['info'][member.id] = {'title' => member.subject_title}

hyrax/lib/tasks/cleanup_broken_filesets.rake

+namespace :rdms do
+  task :cleanup_broken_filesets => :environment do
+    File.where(title: []).destroy_all
+  end
+end