Link from commit to branch is broken

Steps to reproduce

• navigate to commit page (e.g. winniehell/test@ccc141bf)
• click on branch name (e.g. image-comment)

What is the current bug behavior?

nothing happens, browser console displays

 Uncaught TypeError: this.querySelector(...) is null
    T init_details_button.js:4
    r helpers.js:90

What is the expected correct behavior?

navigates to branch (e.g. https://gitlab.com/winniehell/test/-/commits/image-comment)