(core) Undo bug with summary table and raw data view

Summary:
Clicking undo/redo after converting a table to a summary table navigated
to the raw data view.

Test Plan: new test

Reviewers: georgegevoian, alexmojaki

Reviewed By: georgegevoian, alexmojaki

Subscribers: alexmojaki

Differential Revision: https://phab.getgrist.com/D3337

app/client/ui/selectBy.ts

@@ -163,6 +163,9 @@ function createNodes(docModel: DocModel, sections: MaybeSection[]) {
 
 // Creates an array of LinkNode from a view section record.
 function fromViewSectionRec(section: ViewSectionRec): LinkNode[] {
+  if (section.isDisposed()) {
+    return [];
+  }
   const table = section.table.peek();
   const ancestors = new Set<number>();