Cherry-pick #18769 to 7.8: Guard against empty stream.datasource and namespace #18806
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Cherry-pick of PR #18769 to 7.8 branch. Original message:
What does this PR do?
This PR fallbacks to default values if namespace or datasource is an empty string
Why is it important?
Empty string is not a valid value
Checklist
CHANGELOG.next.asciidoc
orCHANGELOG-developer.next.asciidoc
.