In I7b681496e689c22bad1a956e64c12313ae324edb we landed a change that defined icons. This worked a bit too well in Minerva leading to the add topic menu item appearing in Minerva without an icon.
Steps to replicate the issue (include links if applicable):
What happens?:
Add topic button appears with black square icon
What should have happened instead?:
Software version (on Special:Version page; skip for WMF-hosted wikis like Wikipedia):
Other information (browser name/version, screenshots, etc.):
