Avoid exception when deleting an item already deleted (fix bug #180)

radicale/__init__.py

@@ -159,12 +159,16 @@ class CalendarHTTPHandler(server.BaseHTTPRequestHandler):
         item_name = xmlutils.name_from_path(self.path)
         if item_name:
             # Get calendar item
-            items = self._calendar.timezones
             item = self._calendar.get_item(item_name)
+            if item:
+                items = self._calendar.timezones
                 items.append(item)
                 answer_text = ical.serialize(
                     headers=self._calendar.headers, items=items)
                 etag = item.etag
+            else:
+                self.send_response(client.GONE)
+                return
         else:
             # Get whole calendar
             answer_text = self._calendar.text