[Maps] (Tracks layer) - Automatically handle missing locations

[m-adams]

Describe the feature:
v7.11
At the moment, if some document in a track have the location field missing, it draws lines to the equator unless you add a filter to select only document where the location field exists. See screenshots
It would be nicer if the track ignored missing locations automatically.

Describe a specific use case for the feature:

[elasticmachine]

Pinging @elastic/kibana-gis (Team:Geo)

[thomasneirynck]

cc @talevy . Thinking this could be addressed on the elasticsearch-side (?) Main pro would be: if this is addressed on the elasticsearch-side, clients other than Kibana-Maps, will have the same benefit when using the geo_line aggregation.

[talevy]

I've opened elastic/elasticsearch#69395 to fix this. Apologies for the bug! Thought my test caught this scenario. I was wrong!