graph: clear the graph when there is nothing to draw
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oliver-sanders commented
If there is nothing to draw, the graph view currently preserves the last valid graph. This is a little inconsistent, other views go blank.
I think there have been some issue with differentiating between empty and error states once?
We should allow the graph to go blank and, ideally, leave a placeholder where the graph would be to explain this, however, that is a different issue - #332.