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Fix a seg fault that can occur a C API function returns an error without creating a result. We need to initialize the result's internal data to
nullptr, and also handle whenduckdb_result_errorreturnsnullptr. See #142 for the scenario in which this was discovered.It's hard to add a unit test for this because the known case where this can occur is nondeterministic. I added a test that I used to manually repro and verify the fix, but it's skipped by default because of the nondeterminism.