core/bloombits, eth/filters: handle null topics (#15195)
When implementing the new bloombits based filter, I've accidentally broke null topics by removing the special casing of common.Hash{} filter rules, which acted as the wildcard topic until now. This PR fixes the regression, but instead of using the magic hash common.Hash{} as the null wildcard, the PR reworks the code to handle nil topics during parsing, converting a JSON null into nil []common.Hash topic.
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