[uMap] Popup with conditional fields

[Jo]

Hi,

I created a layer with data I downloaded with Overpass and saved as
GeoJSON. Doing it the dynamic way didn't work and I can't seem to clone the
Père Lachaise to see how it's done there. The explanation from the blog
didn't result in success.

Anyway, I added the following to the Popup definition for that layer:

{{https://d1cuyjsrcm0gby.cloudfront.net/{mapillary}/thumb-1024.jpg}}
{{{image}}}
**{species}**
*{species:nl}*
[[http://www.mapillary.com/map/im/{mapillary}|Virtuele wandeling]]

That works great if those fields are actually present, but I need to only
show that when the fields are available and omit it otherwise.

Jo
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