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Addresses a regression recently introduced when we started gossip verifying data columns from EL blobs
```
failures:
network_beacon_processor::tests::accept_processed_gossip_data_columns_without_import
test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 90 filtered out; finished in 16.60s
stderr ───
thread 'network_beacon_processor::tests::accept_processed_gossip_data_columns_without_import' panicked at beacon_node/network/src/network_beacon_processor/tests.rs:829:10:
should put data columns into availability cache: Unexpected("empty columns")
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
```
https://github.com/sigp/lighthouse/actions/runs/15309278812/job/43082341868?pr=7521
If an empty `Vec` is passed to the DA checker, it causes an unexpected error.
This PR addresses it by not passing an empty `Vec` for processing, and not spawning a task to publish.