Skip segments with empty trkseg

Author: hugovk

src/stravavis/process_data.py

@@ -38,6 +38,9 @@ def process_gpx(gpxfile: str) -> pd.DataFrame | None:
 
     for activity_track in activity.tracks:
         for segment in activity_track.segments:
+            if not activity.tracks[0].segments[0].points:
+                continue
+
             x0 = activity.tracks[0].segments[0].points[0].longitude
             y0 = activity.tracks[0].segments[0].points[0].latitude
             d0 = 0