Fix get_session_handle to return only if session handle is present. (#2069)

Author: prmukherj

src/ansys/fluent/core/meta.py

@@ -193,7 +193,7 @@ def wrapper(self, obj=None):
     def __create_get_session_handle(cls):
         def wrapper(self, obj=None):
             root = self.get_root(obj)
-            return root.session_handle
+            return getattr(root, "session_handle", None)
 
         return wrapper