Fix writing NULL geometries through GDAL #188

Job	Run time
Build extension binaries / Generate matrix	28s
Build extension binaries / Windows (windows_amd64, x64-windows-static-md)	1h 5m 36s
Build extension binaries / Linux (linux_amd64, ubuntu:18.04, x64-linux)	33m 16s
Build extension binaries / Windows (windows_amd64_rtools, x64-mingw-static)	1h 32m 56s
Build extension binaries / MacOS (osx_amd64, x86_64, x64-osx)	17m 46s
Build extension binaries / Linux (linux_amd64_gcc4, quay.io/pypa/manylinux2014_x86_64, x64-linux)	35m 44s
Build extension binaries / MacOS (osx_arm64, arm64, arm64-osx)	21m 15s
Build extension binaries / DuckDB-Wasm (wasm_mvp, wasm32-emscripten)	40m 42s
Build extension binaries / Linux (linux_arm64, ubuntu:18.04, arm64-linux)	37m 49s
Build extension binaries / DuckDB-Wasm (wasm_eh, wasm32-emscripten)	40m 31s
Build extension binaries / DuckDB-Wasm (wasm_threads, wasm32-emscripten)	40m 1s
Deploy extension binaries	0s
	7h 6m 4s

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