Update lib/full_text_search/journal_mapper.rb

Co-authored-by: takuya kodama <a.s.takuya1026@gmail.com>

Author: abetomo

lib/full_text_search/journal_mapper.rb

@@ -34,7 +34,7 @@ def upsert_fts_target(options={})
       return unless issue.is_a?(Issue)
 
       fts_target = find_fts_target(initialize: options.fetch(:initialize, true))
-      return if fts_target.blank?
+      return unless fts_target
 
       fts_target.source_id = @record.id
       fts_target.source_type_id = Type[@record.class].id