Add a min-height to the review panel text areas.

services/web/public/stylesheets/app/editor/review-panel.less

@@ -452,6 +452,7 @@
 		color: @rp-type-darkgrey;
 		margin-top: 3px;
 		overflow-x: hidden;
+		min-height: 3em;
 	}
 
 .rp-icon-delete {