Interactive map is sometimes missing

[misialq]

Steps to reproduce:

• use the attached metadata file to draw an interactive map as follows:

  qiime coordinates draw-interactive-map \ 
    --m-metadata-file meta_sample.txt \           
    --p-latitude Latitude \
    --p-longitude Longitude \
    --p-column Depth \            
    --o-visualization test-viz.qzv 

• open the visualization

Expected behaviour: Map is displayed correctly.

Actual behaviour: Map is missing - see the screenshot.