[Fixes #110537726] In selectionDidChange, bail if the grid is not visible. This prevents crash in Leaflet as it attempts to manipulate a non-existant rect.
[Fixes #110537726] In selectionDidChange, bail if the grid is not visible. This prevents crash in Leaflet as it attempts to manipulate a non-existant rect.

concord-consortium/codap,concord-consortium/codap,concord-consortium/codap,concord-consortium/codap,concord-consortium/codap