Bug fix: Make updateChart robust to missing data in dataset. #434
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…r update mechanisms as in chartjs-plugin-streaming.
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When using chartjs-plugin-streaming, the data in datasets is updated by a periodic call to onRefresh or similar function.
In that case, the recommended props to <Line> and other charts are datasets with no data property. This works fine until the Component is updated at which time there is a crash because data is not set.
This PR changed updateChart to check if data is present in the new props and only update if it is.