Project avatars do not include alternative text

Issue Summary

The Bitbucket Server web UI currently does not provide alternative text tags for project avatar images. Per WCAG requirements (see https://www.w3.org/WAI/tutorials/images/decorative/), decorative images must provide at least an empty alternative text (alt="") or designate the element role as presentation.

Steps to Reproduce

1. Navigate to https://<BITBUCKET_URL>/bitbucket/projects
2. Right click > inspect on project's avatar image

Expected Results

The image's HTML includes an 'alt' attribute of null/blank

Actual Results

The image's HTML has no alt attribute:

Notes

This UI design defect results in preventing certain organizations from allowing any Bitbucket Server pages with project or repository listings to be public-facing - resulting in this defect impeding public-private partnerships, and participation by these organizations' development teams in the open-source community.

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available