Strange behavior with missing values in scattergeo

[cpsievert]

http://codepen.io/cpsievert/pen/ZpLbxJ

I discovered this problem when using scatter to make a map of canada:

Supplying the same data to scattergeo gives me this:

Thus, it seems like [0, 0] is being inserted before (or possibly after) null?

[cpsievert]

Also, this seems to work fine with scattermapbox

[etpinard]

I changed my mind. Instead of simply making sure that non-numeric values are skipped in scattergeo traces (as in #964), I'll refactor combine some of the scattermapbox logic into scattergeo should make it easy to add connectgaps to and fill: 'toself' support to scattergeo traces - and maybe also hover text for scattergeo lines in 1.18.0.