Ignoring `null` values when querying

I am working on a map visualization where I query locations and plot them. However, some of the items to be mapped currently have some null values for longitude and latitude. I am aware that I will eventually have to correct those, but until then.

Until this, what is the best way to "filter" these results out from the GraphQL query so that I do not get any errors when mapping the locations? Should this be accomplished in the graphql-schema.js file? Or should this be done when queried React Map Component?

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