Issue weight empty state in sidebar doesn't match other blocks

The issue weight "None" value uses the wrong class name and as a result the font color doesn't match the other "empty" states of the sections preceeding it.

created branch 2010-issue-weight-empty-state-in-sidebar-doesn-t-match-other-blocks

mentioned in merge request !1512 (merged)

I'm not counting anymore how many times we had this issue!

closed via merge request !1512 (merged)

mentioned in commit 424c40ea

mentioned in commit abefd20f