Multi-type subplot problem

[alexcjohnson]

the mock https://rreusser.github.io/plotly-mock-viewer/#plot_types has two problems:

• two of the ternary axes don't draw, and generate errors in d3
  
• the ternary and geo subplots have broken hover text (no main hover label, little blank common label)
  

Interestingly ternary_multiple and geo_multi-geos are both fine… @etpinard speculates that cartesian+non-cartesian may be the culprit. Also weird that this mock renders just fine in the images tests on CI.