1) proposed json fix for breakline issue. 2) how to handle featuers with no geometry

shapefileloader.py

    def featuresToShapely(self):
        if len(self.features) == 0:
            return []

        feats = []
        for feat in self.features:
            # Very hacky, but some line features will not load json at all and unable to test if geometry type == unknown.
            try:
                featobj = json.loads(feat.ExportToJson())
            except:
                geom = ogr.CreateGeometryFromWkt(feat.geometry().ExportToWkt())
                featobj = {
                    "geometry": json.loads(geom.ExportToJson())}
            # TODO: ExportToJSON seems to fail when type: LineStringZM but it seems to work with this hack
            # Essentially converting it to WKT and then back to JSON solves the problem
            # if featobj['geometry']['type'] == 'Unknown':
            #     geom = ogr.CreateGeometryFromWkt(feat.geometry().ExportToWkt())
            #     featobj = {
            #         "geometry": json.loads(geom.ExportToJson())
            #     }

            fields = {}
            for f in self.fields:
                fields[f] = feat.GetField(f)

            feats.append({
                'FID': feat.GetFID(),
                'geometry': shape(featobj['geometry']) if not featobj["geometry"] is None else None, # case when feature contains no geometry (rare)
                'fields': fields
            })
        return feats