fix(rln-relay): handle empty metadata returned by getMetadata proc #2516
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Description
This PR silences the execution error that is received when trying to fetch the rln metadata from the db.
Zerokit's PR: vacp2p/zerokit#231
If it returns a buf of len 0, then we assume the metadata is not found, and proceed execution as usual.
Changes
How to test
make -j16 test
Issue
closes #2471