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

[mmd]

Reading from uninitialized memory is undefined behavior, and triggers valgrind memory error messages as per #1442.

Fixes #1442
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/1443

-- Commit Summary --

  * Avoid reading from empty sparseBlock

-- File Changes --

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

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/1443.patch
https://github.com/openstreetmap/osm2pgsql/pull/1443.diff

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