Perpetual "Loading legend..." when colouring points on Biocache map

[timhicks-ala]

On any Biocache search, go to the Map tab, then "Colour by:" and select any option. The map dots load in different colours correctly, but the legend only shows "Loading legend...".

Reported in: https://support.ehelp.edu.au/a/tickets/164422 https://support.ehelp.edu.au/a/tickets/164162 https://support.ehelp.edu.au/a/tickets/163945 https://support.ehelp.edu.au/a/tickets/170771

[sughics]

Also looking into #780

[sughics]

Fix currently live on biocache-service dev instance. Legend loading as expected https://biocache-dev.ala.org.au/occurrences/search?q=taxa%3A%22koala%22#tab_mapView

[sughics]

Included in biocache-service release 3.2.0