Tea Tavassoli Sjödelius

Empty tooltip is shown for null values

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### Description When there are null values in a timeline chart, the tooltip is shown even if there is no data (y-value) for that that time stamp. Is it not...

white-balance-sunny-outline

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### Before submitting a new icon request, please confirm the following: - [X] I have [searched all issues](https://github.com/Templarian/MaterialDesign/issues?q=is%3Aissue) to make sure there isn't a request for this icon. - [X]...