[tree] Don't allow tiny x-axis domains #909
Merged
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Don't allow tiny x-axis domains -- e.g. if zoomed into a polytomy where the divergence values are all tiny, then we don't want to display the tree topology.
The threshold for tiny is set here arbitrarily at 1E-8, however this will become problematic if we get eukaryotic genomes in nextstrain.
Added the TB dataset so that we can test that in review apps.
Closes #901
Looks good for rectangular trees. Radial / unrooted don't look great, but that's not a regression and needs more work in the future.