Handle features with missing geometry

[eyeseast]

GeoJSON can be valid even if it's missing a geometry, but yield_records will throw a key error in that case:

def yield_records(features, pk, spatialite):
    for feature in features:
        record = {}
        if "id" in feature:
            record["id"] = feature["id"]
        record.update(feature.get("properties") or {})
        if spatialite:
            record["geometry"] = shape(feature["geometry"]).wkt
        else:
            record["geometry"] = feature["geometry"]
        yield record