code: def test_call_none_is_no_result():
      @hookimpl
      def m1():
          return 1
  
      @hookimpl
      def m2():
          return None
  
      res = MC([m1, m2], {}, firstresult=True)
      assert res == 1
      res = MC([m1, m2], {}, {})
      assert res == [1]
  
file_path: catboost/contrib/python/pluggy/py2/tests/test_multicall.py
imports: import pytest
  from pluggy import HookCallError, HookspecMarker, HookimplMarker
  from pluggy.hooks import HookImpl
  from pluggy.callers import _multicall, _legacymulticall
label_desc: Use image node_id 7 for calling a global function with example usage: test_call_none_is_no_result() and returns: int, None