Change name `stmt`, which is abbreviation for statement, to `statement`. Fix bug of BlockStatement which occurs in case of empty block statement.
Change name `stmt`, which is abbreviation for statement, to `statement`.
Fix bug of BlockStatement which occurs in case of empty block statement.

kmizu/onion,onionlang/onion,onion-lang/onion,kmizu/onion,onionlang/onion,onion-lang/onion