Sender IO errors don't show paths

[reidsunderland]

We lost some useful information with this change (#1037). Now we only see which file failed to send, before we got a more generic error, but we saw the full path.

This is what we got before:

sarracenia/sarracenia/flow/__init__.py

Lines 2545 to 2547 in 6ad476d

	logger.error("Delivery failed %s" % msg['new_dir'] + '/' +
	msg['new_file'])
	logger.debug('Exception details: ', exc_info=True)

The new message doesn't include the path:

sarracenia/sarracenia/flow/__init__.py

Lines 2403 to 2404 in 6ad476d

	except Exception as ex:
	logger.error( f"could not send inflight=None {new_file}: {ex}" )

Originally posted by @reidsunderland in #1037 (comment)

[reidsunderland]

I created an issue for this, because it was just a comment on a closed PR and I've been confused multiple times when trying to find it.