Confusing/unhelpful message: 'Operator '__else__=None' was not found. Unmapped streams will be included in output.'

This message essentially means that stream maps are not being used or there's no 'ignore the rest' instruction. It should not be in the primary log output and can safely be removed, or at least sent to the 'debug' stream instead of 'info'.

As raised in slack https://meltano.slack.com/archives/C01PKLU5D1R/p1653068703577009:

2022-05-20T17:43:44.630129Z [info ] time=2022-05-20 10:43:44 name=root level=INFO message=Operator '__else__=None' was not found. Unmapped streams will be included in output. cmd_type=extractor job_id=testbq name=tap-quickbase-json run_id=8e5d3feb-683c-4a6c-a146-20520fe083db stdio=stderr