SQL: Handle null values better #12
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mysql_stmt_bind_result()will not change the length parameter if the result is null, so we end up trying to allocate memory using an uninitialized location for size, which tends to fail with std::bad_alloc. So now we initialize it to zero beforehand.Verified with the Arelith problematic query. Added tests to nwnx_sql_t.nss. Didn't test on PgSQL.