Avoid dividing by zero for sparkline in time table viz #3679
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When calculating ratios to add to the sparkline, we should not be dividing by zero or null values. Instead I'm passing a null value to sparkData. This will result in a blank space in the sparkline. This matches how the line chart handles dividing by zero or null.
Currently, dividing by null values or 0 is breaking the sparkline so no part of the chart shows up.