chore: rm redundant if empty check (#4923)

crates/payload/basic/src/lib.rs

@@ -861,10 +861,8 @@ where
 
     let mut payload = BuiltPayload::new(attributes.id, sealed_block, total_fees);
 
-    if !blob_sidecars.is_empty() {
     // extend the payload with the blob sidecars from the executed txs
     payload.extend_sidecars(blob_sidecars);
-    }
 
     Ok(BuildOutcome::Better { payload, cached_reads })
 }