Reproduce:

• goto detail view
• select frequency heatmap

Expected:

• Loading indicator is displayed

Observed:

• For one or two frames, "No Data" is displayed (it might help to put a debugger statement in the hasNoData function to reproduce this)
• after that, the loading indicator is displayed

Hint:

• only happens when the view is first switched. Subsequent switches work normally
• we need to check for the heatmap loading state in the hasNoData function and only show the "No Data" overlay if the heatmap data is already loaded