3be209d103297aaf2fe4711e237a65046488ea19 rpc: Always throw in getblockstats if -txindex is required (João Barbosa)
Pull request description:
Previously blocks with only the coinbase transaction didn't cause
the RPC error even if the requested stats required -txindex and
it wasn't enabled.
Fixes #14499.
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https://github.com/bitcoin/bitcoin/pull/14518/commits/3be209d103297aaf2fe4711e237a65046488ea19
Backport of Core PR14518