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nws: fix null string comparison when reading visibility

Colin Sane requested to merge colinsane/libgweather:pr-nws-fix-visibility-segfault into main

fixes a segfault observed when using the NWS backend. uom isn't guaranteed to be non-null since it comes from the API: we check against NULL in exactly this same way in all the other select_read_<property> functions, seems this one was just overlooked.

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