old_contents: 
  
  class ExportAppException(Exception):
      pass
  
  
  class BadExportConfiguration(ExportAppException):
      pass
  
  
  class ExportNotFound(ExportAppException):
      pass
  
  
  class ExportFormValidationException(Exception):
      pass
  
  
  class ExportPermissionsException(Exception):
      pass
  
  
  class ExportAsyncException(Exception):
      pass
  
new_contents: 
  
  class ExportAppException(Exception):
      pass
  
  
  class BadExportConfiguration(ExportAppException):
      pass
  
  
  class ExportNotFound(ExportAppException):
      pass
  
  
  class ExportFormValidationException(Exception):
      pass
  
  
  class ExportAsyncException(Exception):
      pass
  
subject: remove unused exception