Fixed issue with suggestions not being shown by default for terms menu items,...

Fixed issue with suggestions not being shown by default for terms menu items, fixed issue with terms widget histogram normalization.

Changelog: Fixed

nomad/mkdocs/__init__.py

@@ -20,9 +20,12 @@
 Definitions that are used in the documentation via mkdocs-macro-plugin.
 """
 
+from types import UnionType
+from pydantic.fields import FieldInfo
 import yaml
 import json
 import os.path
+
 from typing import get_args
 
 from inspect import isclass