Divergence tree does not display properly on the x-axis for nextflu site about seasonal-flu HOT 4 OPEN

The seasonal-flu build's tree JSONs are missing the xvalue attribute leading to a NaN value in the nextflu code.
The xvalue attribute should be included in the augur v1 export, but it's not guaranteed since it's technically a deprecated attribute.

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Great catch! Would it be reasonable to update the calculation of branch lengths in nextflu to use the branch_length attribute we export in the auspice JSONs instead of the missing xvalue parameter?

We probably don't want to start exporting a deprecated field just for nextflu and updating the nextflu code would allow all existing datasets to work as they are without regenerating them...

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When the "timetree" is off, the d3 x value gets assigned to the xvalue. So all downstream d3 transformations error out with the NaN x value.

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If I assign the d3 x value to node.attr['div'], this results in a divergence view with no gridlines. From what I can see, the drawGrid() function only applies to the timetree view. Is this the expected behavior?

Edit: see blab/nextflu#154

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