Visualizations: edge case skeleton spinner faceted/unfaceted layout issue

[bobular]

To reproduce:
Any study. Add one or more subsetting filters.
Make any visualization, add a facet variable.
Now note that any variable changes you make while faceting is active, the layout stays in faceting mode and the page update looks relatively smooth.

However, if you open the global filters popup and cancel a filter you made, you'll notice the layout switch back to unfaceted, before switching to faceted again.

This is because the visualisations are waiting for filteredCounts.pending to be untrue - this data is needed to decide on showing missing data overlays and facets - and when pending is true, data becomes undefined and then the plot components don't know how to lay themselves out.