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.
Tree-SHA512: d3a6402889e3ce7199632e79eba66d7d471ff7de5c564d35312e2340cc6d84ef544a8172548fbc2eedf5e637b56dc57bbf7a9815ab798c7f226755f897fd8f3e