Hi,

I would like to propose a feature about comment type.
With GITLAB_COMMENT_TYPE we can set it to discussion or note.
When a changeset is missing I would like to have a discussion to block merge request without resolution of the discussion.
If one is set a simple note is ok

I propose to add an optional configuration GITLAB_COMMENT_TYPE_IF_MISSING to allow this behaviour.

If it is ok I will create a PR with this modification