Fix référence à la source

src/agenda_culturel/models.py

@@ -609,11 +609,11 @@ class Event(models.Model):
         if self.import_sources:
             result = []
             for s in self.import_sources:
-                o_s = RecurrentImport.objects.get(source=s)
+                o_s = RecurrentImport.objects.filter(source=s).first()
                 if o_s:
                     result.append((o_s.get_absolute_url(), o_s.name))
                 else:
-                    result.append((o_s, o_s))
+                    result.append((s, s))
             return result
         else:
             return []