comment_count from issues/{id}/ does not match the number of items received from issues/{id}/comments/ (BB-10833)

Some issue comments contain only status changes (changed milestone, changed priority, edited description etc). Those comments are included in comment_count field in {{https://bitbucket.org/api/1.0/repositories/

{owner}/{slug}/issues/{id}/}}.

Previously {{https://bitbucket.org/api/1.0/repositories/{owner}

/

{slug}

/issues/

{id}

/comments/}} included those status change comments with contents=null. Now these messages are missing from response completely which causes comment_count to show higher values than there are real comments.

Related request from two years ago: https://bitbucket.org/site/master/issue/4259/add-status-changes-to-issue-comments