paper-chips component throws an error while executing inputFocus action

[gpluta]

The issue can be reproduced on the demo page containing paper-chips examples.

When we fill any value in the 'Default template' example and focus out of the input and then focus back again, an error is thrown:
Uncaught TypeError: Cannot read property 'close' of undefined

It seems that this statement is not guarded properly: https://github.com/gpluta/ember-paper/blob/master/addon/components/paper-chips.js#L77

the autocomplete param is an object with an 'actions' prop when the inputFocus action is called from the paper-chips-autocomplete component. Otherwise it is a string containing the value enered in the input.

The if () {} condition should contain a check if the actions prop is available on autocomplete parameter. It should look like:

      if (isPresent(autocomplete) && autocomplete.actions) {
        autocomplete.actions.close();
      }

Can I create a PR for this little fix? Am I missing something important?