Take singleton as a baltic tree object

[andersonbrito]

Hi,

I'm trying to find a way to make baltic treat singletons along polytomies as tree objects (number of leaves = 1), so that I can show those in a exploded layout. This seems to be not possible to perform in baltic 0.1.5, since the subtree.getInternal() step fails, and I can't get the subtree.root.absoluteTime. In fact, perhaps due to some default option, only actual clades (number of leaves >= 2) can be shown in the final exploded tree plot.

Example: how do I get this singleton Iceland genome to be shown in an exploded layout, to show an introduction into that country?
https://nextstrain.org/community/grubaughlab/CT-SARS-CoV-2/update2?branchLabel=aa&c=country&s=Iceland/91/2020

Cheers