[6.2.0]Fix seeking of empty chunkers. #17830
Merged
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Empty chunkers are strange in that they emit one empty chunk and then end. This change makes them properly resetable. Previously, reset() on a empty chunker could result in a NullPointerException.
Also, it's important to call close() on the underlying data stream even if it's empty.
Closes #17797.
Commit: cfef67d
PiperOrigin-RevId: 517119206
Change-Id: Iff7908d6cd0633aa2a355ea89f8e647a9fefffcd