Don't pause the pipeline on invalid URLs

[juliangruber]

In #224 (comment) we have discovered, that invalid URLs can be submitted to the contract, and therefore to the indexer worker. It doesn't benefit the worker to respond with 400s, which can cause the pipeline to halt.

[juliangruber]

37e0e83

[bajtos]

@juliangruber can we close this issue as done, now that 37e0e83 was deployed?

[juliangruber]

Done!