Bug fix: display correct metadata when data scanned is 0

[Nautman]

When data_scanned is 0 in the metadata for a query result, it is weirdly displayed as

1 second runtime0

My proposal is to write it like

1 second runtime. Using cached data.

I suppose it would be correct to say that it is using cached data in the case when it is 0?

redash/client/app/pages/queries/components/QueryExecutionMetadata.jsx

Lines 70 to 75 in a37ef3b

	{queryResultData.metadata.data_scanned && (
	<span className="m-l-5">
	Data Scanned
	<strong>{prettySize(queryResultData.metadata.data_scanned)}</strong>
	</span>
	)}

Link to image showing issue