[Tile-serving] [openstreetmap/osm2pgsql] Avoid reading from empty sparseBlock (#1445)

[mmd]

Fixes #1442

(supersedes #1443)
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/1445

-- Commit Summary --

  * Avoid reading from empty sparseBlock

-- File Changes --

    M src/node-ram-cache.cpp (4)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/1445.patch
https://github.com/openstreetmap/osm2pgsql/pull/1445.diff

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