Course list shows wrong rating when resubmitting an anonymous review

[hmil]

Repro:

• pick an empty course,
• review it,
• edit your review: check "anonymous"
• before approving the review, go back to a course list showing this course
• The stars appear disabled but with a grade

[hmil]

Description matches patch 47a287ee37dc4fa4b72e95ca1e95d3efa0052744 Should be fixed now.