[Map] Fix geocode bug

[headphoner]

trafficstars

Currently in the map widget, failure to geocode an address for one row causes all rows below it to no longer geocode. This proposed change resolves the underlying unhandled null reference.

Old behavior

https://github.com/user-attachments/assets/480d69e2-9225-4528-8f1e-11353c6c8a44

New behavior

https://github.com/user-attachments/assets/0f0ff9ba-315f-44e8-9069-c00af39557bc

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[headphoner]

Thanks for the comments @berhalak . I've merged them into the PR. Please review and let me know what you think.