Better Reporting of Failed Exported Objects

[flipmcf]

Currently during an export, an object that throws an exception during export is written to the Error Log and ignored.

I would like to propose we add the obj.absolute_url() to a list of 'failed exports' and .... do something with it....

"do something" might be to simply append it to the end of the json export, or print the list to the form after the export, or write it to a separate file?

For my needs, appending a valid json list of skipped objects at the end of the file "ExportContent" would do nicely.

collective.exportimport/src/collective/exportimport/export_content.py

Lines 315 to 316 in cefa76c

	except Exception:
	logger.exception(u"Error exporting %s", obj.absolute_url(), exc_info=True)

try: 
     <snip>...
     item = self.update_export_data(item, obj) 
  
     yield item 
 except Exception: 
     logger.exception(u"Error exporting %s", obj.absolute_url(), exc_info=True)