danmunn/redmine_issue_history_tabs — pull request #1 by bckp (2012-06-14 08:38:18+00:00)
Title: Catch the exception if some of the elements are not present on the page

In my case, your JS throws exception becouse it cannot find element with IDL: tab-history_comments
With my modification, it will catch the exception prototype throws, so no error report in javascript console