Fix view selection bug in Workbench
Fix view selection bug in Workbench

When a view for a basket item was selected, and then another basket item
was selected, the previous view would remain selected even if it didn't
exist anymore. This also prevents a useless POST request when the last
basket item is deselected.

YourDataStories/components-visualisation,YourDataStories/components-visualisation,YourDataStories/components-visualisation