File-based CDK: avoid error on empty stream when running discover #38230
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What
Part of fix for https://github.com/airbytehq/product-request-backlog/issues/138
How
Return default
schemaless_schema
instead of raisingNoFilesMatchingError
exception when empty stream is found duringdiscover
Review guide
default_file_based_stream.py
User Impact
No
Can this PR be safely reverted and rolled back?