The documentation for the `location` property states that "This property contains `nil` if the map view is not currently showing the user location or if the user’s location has not yet been determined." The iOS SDK presently returns a garbage value, which has some rather annoying consequences when the value should logically be nullable. This change should rectify the issue.
With _location no longer initialized to an invalid coordinate, trying to access `_location.coordinate` when `_location == nil` will return `0, 0`, which is a valid coordinate.
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