Improve handling when multiple results are returned

[astiskala]

Currently, if there are multiple results, the component will iterate over each of them and take the values from the last result in the array.

Based on the Geocoding API documentation:

Generally, addresses are returned from most specific to least specific; the more exact address is the most prominent result

As such, it would make sense to take the values from the first result where they are available.

This change will check whether the value has already been populated from an earlier result, and if so, not override it with a later one.

[gregoryduckworth]

Looks good! Will push up these changes.