MNWPVerticalSectionActor: Cross-section and all labels disappear
requested to merge BTost/met.3d:31-mnwpverticalsectionactor-cross-section-and-all-labels-disappear into master
fixed rendering of vcs actor (disappearing labels and sections (second render pass needed?!); missing labels delete when switching to none waypoints model or deleting last variable)
Closes #31 (closed)