private static boolean verifyArray(final String key, final TomlParseResult tomlParseResult) {
    return tomlParseResult.isArray(key) && !tomlParseResult.getArrayOrEmpty(key).isEmpty();
  }
Validate auth file.

@param commandLine the command line to use for parameter exceptions
@param filename the auth file
@param type the RPC type
@return the auth filename
app/src/main/java/org/hyperledger/besu/cli/custom/RpcAuthFileValidator.java