Charts should show loading icon when loading data

[brylie]

Currently, some charts start out with a message saying essentially "no data found" while fetching data from the backend. E.g.

• the Resident Profile page says "Resident has no recorded activities."
• the Homes page shows "no home added to group" when loading the list of homes

Ensure that all charts show a loading icon when fetching data from the server and only show a message when no data exists.

A good example to follow would be the Report page, which shows a spinner on each chart when loading data.