fix update_namespace_properties in hive catalog

Author: jayceslesar

pyiceberg/catalog/hive.py

@@ -800,7 +800,7 @@ def update_namespace_properties(
             if removals:
                 for key in removals:
                     if key in parameters:
-                        parameters[key] = None
+                        parameters.pop(key)
                         removed.add(key)
             if updates:
                 for key, value in updates.items():

tests/catalog/test_hive.py

@@ -1156,7 +1156,7 @@ def test_update_namespace_properties(hive_database: HiveDatabase) -> None:
             name="default",
             description=None,
             locationUri=hive_database.locationUri,
-            parameters={"test": None, "label": "core"},
+            parameters={"label": "core"},
             privileges=None,
             ownerName=None,
             ownerType=1,