Skip downloading GPX for activities without any location data

This should fix the gpx download crashing when trying to download
activities that only have heart rate data, like swims recorded using
smartwatches.

src/strava_offline/gpx.py

@@ -47,7 +47,7 @@ def download_gpx(strava: StravaWeb, activity_id: int, path: Path) -> None:
 
 
 def download_activities(db: sqlite3.Connection, strava: StravaWeb, dir_activities: Path) -> None:
-    for activity in db.execute("SELECT id FROM activity WHERE upload_id IS NOT NULL"):
+    for activity in db.execute("SELECT id FROM activity WHERE upload_id IS NOT NULL AND has_location_data"):
         activity_id = int(activity['id'])
         if find_gpx(dir_activities, activity_id):
             continue

src/strava_offline/sqlite.py

@@ -35,7 +35,7 @@ def database(config: config.DatabaseConfig) -> Iterator[sqlite3.Connection]:
 #  * sync_activity
 #
 # The tables will be recreated using the stored json data and the new schema.
-SCHEMA_VERSION = 1
+SCHEMA_VERSION = 2
 
 
 def schema_init(db: sqlite3.Connection) -> None:
@@ -60,6 +60,7 @@ def schema_init(db: sqlite3.Connection) -> None:
         ", gear_id TEXT"
         ", type TEXT"
         ", commute BOOLEAN"
+        ", has_location_data BOOLEAN"
         ")"
     ))
 
@@ -150,8 +151,9 @@ def sync_activity(activity, db: sqlite3.Connection):
             ", gear_id"
             ", type"
             ", commute"
+            ", has_location_data"
             ")"
-            "VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)"
+            "VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)"
         ),
         (
             activity['id'],
@@ -166,6 +168,7 @@ def sync_activity(activity, db: sqlite3.Connection):
             activity['gear_id'],
             activity['type'],
             activity['commute'],
+            activity['start_latlng'] is not None,
         )
     )