[Tile-serving] [openstreetmap/osm2pgsql] Missing empty string check in flex write_double (#1416)

[Jochen Topf]

Checking real numbers is always tricky because you can't just use `==` to compare them, so I cheated and didn't write out all the tests it should have. I have changed the tests in a way similar to what you suggested and fixed the code.

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