Fix typing in tagging py (#1371)

Signed-off-by: Bala.FA <bala@minio.io>

minio/tagging.py

@@ -18,13 +18,13 @@
 
 from __future__ import absolute_import, annotations
 
-from typing import Type, TypeVar
+from typing import Type, TypeVar, cast
 from xml.etree import ElementTree as ET
 
 from .commonconfig import Tags
 from .xml import Element, SubElement, find
 
-K = TypeVar("K", bound="Tagging")
+A = TypeVar("A", bound="Tagging")
 
 
 class Tagging:
@@ -39,18 +39,16 @@ def tags(self) -> Tags | None:
         return self._tags
 
     @classmethod
-    def fromxml(cls: Type[K], element: ET.Element) -> K:
+    def fromxml(cls: Type[A], element: ET.Element) -> A:
         """Create new object with values from XML element."""
-        tag_set = find(element, "TagSet")
-        if tag_set is None:
-            raise ValueError("missing XML tag 'TagSet'")
+        element = cast(ET.Element, find(element, "TagSet", True))
         tags = (
-            None if find(tag_set, "Tag") is None
-            else Tags.fromxml(tag_set)
+            None if find(element, "Tag") is None
+            else Tags.fromxml(element)
         )
         return cls(tags)
 
-    def toxml(self, element: ET.Element) -> ET.Element:
+    def toxml(self, element: ET.Element | None) -> ET.Element:
         """Convert to XML."""
         element = Element("Tagging")
         if self._tags: