[Tile-serving] [osm2pgsql] Cleanup based on the output of LLVM's static analyzer (#299)

[Paul Norman]

>          int nodec;
>  
> +        assert(ndc > 0 && "no nodes to proccess");

Could we change the if check above to `if (places.has_data() && ndc > 0)`?

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https://github.com/openstreetmap/osm2pgsql/pull/299/files#r25124495
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