Fix infinite recursion when failing to download shield image #1888
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If there’s no image after the shield downloading operation completes, then there’s no reason to regenerate the attributed text that would embed that image.
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If there’s no image after the shield downloading operation completes, then there’s no reason to regenerate the attributed text that would embed that image. Bailing instead of regenerating the attributed text heads off infinite recursion that results whenever the shield image URL can’t be reached for some reason, such as the situation described in mapbox/mapbox-directions-swift#322.
Fixes #1887.
/cc @mapbox/navigation-ios @kevinkreiser