[dtl]: TypeError: batchTxs is not iterable

[guoshijiang]

Describe the bug

/opt/mantle/packages/data-transport-layer/dist/src/services/da-ingestion/service.js:340
throw new Error(eigen layer sync finish, error is: ${error});
^
Error: eigen layer sync finish, error is: TypeError: batchTxs is not iterable
at DaIngestionService._storeBatchTransactionsByDSId (/opt/mantle/packages/data-transport-layer/dist/src/services/da-ingestion/service.js:340:19)
at processTicksAndRejections (node:internal/process/task_queues:96:5)
at async DaIngestionService.updateTransactionBatches (/opt/mantle/packages/data-transport-layer/dist/src/services/da-ingestion/service.js:228:17)

When we run update da tools, when dl-retriever return null, dtl service will down