revert cleaner

app/services/importers/cleaner.rb

@@ -54,7 +54,7 @@ module Importers
   
     def self.remove_control_chars(string)
       # Control chars & LSEP are invisible or hard to detect
-      string = string.delete("", "
", "
", "’")
+      string = string.delete("
", "
", "
", "’")
       string = string.gsub /\u2028/, ''
       string
     end