[Tile-serving] [openstreetmap/osm2pgsql] Avoid reading from empty sparseBlock (#1443)

[mmd]

@mmd-osm pushed 0 commits.



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View it on GitHub:
https://github.com/openstreetmap/osm2pgsql/pull/1443/files/6800090ceb60f26d57dcd8762d201c4cedfc790f..86ad6d6026a17ae2f714f37e4288330b5ee4a01d
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