Fix GPS globe startup and satellite polling errors

tests/test_gps_routes.py

@@ -61,3 +61,18 @@ def test_auto_connect_attaches_callbacks_when_reader_already_running(client, mon
     assert payload['status'] == 'connected'
     assert reader.position_callbacks == [gps_routes._position_callback]
     assert reader.sky_callbacks == [gps_routes._sky_callback]
+
+
+def test_satellites_returns_waiting_when_reader_not_running(client, monkeypatch):
+    """Satellite endpoint should return a non-error waiting state when reader is down."""
+    monkeypatch.setattr(gps_routes, 'get_gps_reader', lambda: None)
+
+    with client.session_transaction() as sess:
+        sess['logged_in'] = True
+
+    response = client.get('/gps/satellites')
+    payload = response.get_json()
+
+    assert response.status_code == 200
+    assert payload['status'] == 'waiting'
+    assert payload['running'] is False