message: fix: missing key when verifying adhoc filters in merge_extra_filters
diff: @@ -1025,8 +1025,8 @@ def merge_extra_filters( # pylint: disable=too-many-branches
  for existing in adhoc_filters:
  if (
  existing["expressionType"] == "SIMPLE"
  - and existing["comparator"] is not None
  - and existing["subject"] is not None
  + and existing.get("comparator") is not None
  + and existing.get("subject") is not None
  ):
  existing_filters[get_filter_key(existing)] = existing["comparator"]
  