"Research at Cambridge" link in global header broken in mobile displays

[alt36]

When in mobile mode, the "Research at Cambridge" link in the global header becomes simply

<a href="">

i.e. the href attribute is empty, which leads to the link always being to the currently-viewed page.

I can see this on my Drupal site (https://www.ch.cam.ac.uk), a randomly-chosen Falcon-on-Plone site (https://www.phy.cam.ac.uk) and a PL site that is neither of those things (https://www.geog.cam.ac.uk), suggesting to me that the problem is in the "core" js in this repo. Curiously though, the link on https://www.cam.ac.uk - which I believe uses a non-standard PL implementation - works fine, so comparing with the js there might help identify the cause.

[tombsar]

Issue also affects my site which is mostly a copy-paste of this repository. I don't see anything wrong with the html, so likely the Javascript is at fault. Possibly related to that link having class="campl-no-drawer"?