code: def skip_test_if_no_valid_conn_id(func: T) -> T:
      """
      Function decorator that skip this test function if no valid connection id is specified.
      """
      function_signature = signature(func)
  
      @wraps(func)
      def wrapper(*args, **kwargs) -> None:
          bound_args = function_signature.bind(*args, **kwargs)
          self = args[0]
  
          if self.hook is not None:
              return func(*bound_args.args, **bound_args.kwargs)
          else:
              return None
  
      return cast(T, wrapper)
  
imports: from __future__ import annotations
  from functools import wraps
  from inspect import signature
  from typing import Callable, TypeVar, cast
label_desc: Use image node_id 1 for calling a global function with example usage: skip_test_if_no_valid_conn_id(func) and returns: cast, func, None