fix(rln-relay): segfault when no params except rln-relay is passed in #2047
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Description
When no other params except
--rln-relay
is provided to wakunode2, it segfaults.This is due to the static group manager unwrapping the membership index without checking if it was set.
This PR fixes that and errors out appropriately.
Changes
How to test
make -j12 wakunode2
./build/wakunode2 --rln-relay=true
Issue
closes #2039