Gestion événements mobilizon sans image

src/agenda_culturel/import_tasks/generic_extractors/mobilizon.py

@@ -147,7 +147,10 @@ query($preferredUsername: String!, $afterDatetime: DateTime, $page: Int) {
                 for e in events:
                     title = e["title"]
                     event_url = e["url"]
-                    image = e["picture"]["url"]
+                    if "picture" in e and e["picture"] is not None:
+                        image = e["picture"]["url"]
+                    else:
+                        image = None
                     location = (
                         e["physicalAddress"]["description"]
                         + ", "