Since constructs like 'if ok {', where 'ok' actually means 'watched_group_id is set' especially when they are located far from the definition of 'ok' variable are not very meaningful, it's been decided to get rid of 'ok' meaning 'watched_group_id is set'.
In this change, 'ok' meaning 'watched_group_id is set' gets renamed into 'watchedGroupIDSet' first.
Then, 'watchedGroupIDSet' gets renamed into 'watchedGroupIDIsSet' to improve readability even beyond.
Since constructs like 'if ok {', where 'ok' actually means 'watched_group_id is set' especially when they are located far from the definition of 'ok' variable are not very meaningful, it's been decided to get rid of 'ok' meaning 'watched_group_id is set'.
In this change, 'ok' meaning 'watched_group_id is set' gets renamed into 'watchedGroupIDSet' first. Then, 'watchedGroupIDSet' gets renamed into 'watchedGroupIDIsSet' to improve readability even beyond.