Include heathrow airport pin on map for conference without booked flights

Closes: #115

web_view.py

@@ -7,6 +7,7 @@ import operator
 import os.path
 import sys
 import traceback
+import typing
 from datetime import date, datetime, timedelta
 
 import flask
@@ -20,6 +21,7 @@ import agenda.holidays
 import agenda.thespacedevs
 import agenda.trip
 from agenda import format_list_with_ampersand, travel
+from agenda.types import StrDict
 
 app = flask.Flask(__name__)
 app.debug = False
@@ -217,6 +219,7 @@ def trip_page(start: str) -> str:
     """Individual trip page."""
     trip_iter = iter(agenda.trip.build_trip_list())
     today = date.today()
+    data_dir = flask.current_app.config["PERSONAL_DATA"]
 
     prev_trip = None
     for trip in trip_iter:
@@ -230,6 +233,22 @@ def trip_page(start: str) -> str:
 
     coordinates = agenda.trip.collect_trip_coordinates(trip)
     routes = agenda.trip.get_trip_routes(trip)
+    if any(route["type"] == "flight" for route in routes) and not any(
+        pin["type"] == "airport" for pin in coordinates
+    ):
+        airports = typing.cast(
+            dict[str, StrDict], travel.parse_yaml("airports", data_dir)
+        )
+        lhr = airports["LHR"]
+        coordinates.append(
+            {
+                "name": lhr["name"],
+                "type": "airport",
+                "latitude": lhr["latitude"],
+                "longitude": lhr["longitude"],
+            }
+        )
+
     for route in routes:
         if "geojson_filename" in route:
             route["geojson"] = agenda.trip.read_geojson(route.pop("geojson_filename"))