Improve user messaging of handling of zero-data retrievals

[jameshawkes]

Is your feature request related to a problem? Please describe.

2024-01-24 06:48:43 - INFO - Sending request...
{'request': 'class: rd\n'
"date: '20240118'\n"
'expver: i7yv\n'
'levtype: sfc\n'
'param: '
'8.128/9.128/32.128/33.128/34.128/39.128/40.128/41.128/42.128/44.128/45.128/58.128/129.128/139.128/141.128/144.128/146.128/147.128/151.128/164.128/165.128/166.128/167.128/168.128/169.128/170.128/175.128/176.128/177.128/178.128/179.128/182.128/183.128/189.128/205.128/228.128/235.128/236.128/238.128/243.128/251.228/260015/260121\n'
"step: '0'\n"
'stream: oper\n'
"time: '0000'\n"
'type: fc\n',
'verb': 'retrieve'}
2024-01-24 06:48:43 - INFO - Request accepted. Please poll [redacted] for status
2024-01-24 06:48:43 - INFO - Checking request status (161280ca-08e1-429e-838f-977bdf0f0055)...
2024-01-24 06:48:43 - INFO - The current status of the request is 'queued'
2024-01-24 06:48:44 - INFO - The current status of the request is 'processing'
2024-01-24 06:48:45 - INFO - The current status of the request is 'processed'
2024-01-24 06:48:45 - INFO - Starting data download (application/x-grib)...
2024-01-24 06:48:45 - INFO - Saving data into x.grib...
2024-01-24 06:48:45 - INFO - Data downloaded successfully
2024-01-24 06:48:45 - INFO - Download rate 0.0B/s
2024-01-24 06:48:45 - INFO - Data saved successfully into x.grib

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