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Handle null titles/empty channels in Tip
Aims to fix https://github.com/observablehq/plot/issues/2274
This PR allows the render function of tooltips (Tip) to handle null values for a title.
See the issue linked above for steps to reproduce the issue and some more reasoning behind this PR.
To be clear, this MR allows null titles to render properly for tooltips, i.e. it renders an empty tooltip.