docs: def _get_instance_changes(current, state):
      '''
      get modified properties
      '''
      # get keys
      current_keys = set(current.keys())
      state_keys = set(state.keys())
  
      # compare configs
      changed = salt.utils.data.compare_dicts(current, state)
      for change in salt.utils.data.compare_dicts(current, state):
          if change in changed and changed[change]['old'] == "":
              del changed[change]
          if change in changed and changed[change]['new'] == "":
              del changed[change]
  
      return changed