Fix warnings from pg_dump being treated as fatal errors #13
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Warnings from pg_dump are sent to stderr and the code treats everything in stderr as a fatal warning.
This PR fixes that by checking if the backup file is empty or not.
If there is text in stderr and the dump file is not empty, treat the text in stderr as a warning and continue the backup.
if there is text in stderr and the dump file is empty, treat that as a fatal error and halt the backup.