fix(blooms): skip empty blooms on reads

[owen-d]

Read path safeguard to prevent filtering chunks associated with empty blooms while we work on finding the underlying cause of empty blooms in compaction.

[grafanabot]

Hello @salvacorts!
Backport pull requests need to be either:

• Pull requests which address bugs,
• Urgent fixes which need product approval, in order to get merged,
• Docs changes.

Please, if the current pull request addresses a bug fix, label it with the type/bug label.
If it already has the product approval, please add the product-approved label. For docs changes, please add the type/docs label.
If the pull request modifies CI behaviour, please add the type/ci label.
If none of the above applies, please consider removing the backport label and target the next major/minor release.
Thanks!