Porting EmptySource to 1.7 branch

HEPCloud / decisionengine

HEPCloud Decision Engine framework

Apache License 2.0

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Closed vitodb closed 2 years ago

vitodb commented 2 years ago

This PR (cherry picked from commit c1cb8258726042bb0217a0d89fde764baa0f965a) is to port EmptySource to 1.7 branch.