sink-mongo: skip mongo operations if no data provided

apibara / dna

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sink-mongo: skip mongo operations if no data provided #348

Closed fracek closed 8 months ago

fracek commented 8 months ago

Summary

This PR fixes a MongoDB error if the sink received no data from the transform function. This usually happens once the indexer reaches the tip of the chain.

Testing strategy

Run an indexer and wait until it reaches an accepted or pending block.
Before this PR, the indexer prints an error. After this PR the indexer works as expected.