code: @Nullable
    public IValidationExecutorSet getOfID (@Nullable final VESID aID)
    {
      if (aID == null)
        return null;
  
      return m_aRWLock.readLocked ( () -> m_aMap.get (aID));
    }
docs: Find the validation executor set with the specified ID.
  
  @param aID
  The ID to search. May be <code>null</code>.
  @return <code>null</code> if no such validation executor set is registered.