ColumnChunkPageReadStore.close() NPEs if setReleaser() was never called, skipping buffer cleanup in finally

[nastra]

Describe the bug, including details regarding any error messages, version, and platform.

ColumnChunkPageReadStore.close() NPEs if setReleaser() was never called. Also it's possible that the releaser itself isn't closed when releasing the buffers of the readers fails anywhere in the loop

Component(s)

Core