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**Description:** Fix "`TypeError: 'NoneType' object is not iterable`" when the auth_context is absent in PebbloRetrievalQA. The auth_context is optional; hence, PebbloRetrievalQA should work without it, but it throws an error at the moment. This PR fixes that issue. **Issue:** NA **Dependencies:** None **Unit tests:** NA --------- Co-authored-by: Chester Curme <chester.curme@gmail.com>