Div styling through dialog might be broken

[Sa'ar Zac Elias]

• Open a sample that has this style in its style set:

  	{ name : 'TEST1', element: 'div', styles : { 'color' : 'red' } },
  }}
   * Click inside the sample content and click the div icon.
   * Choose TEST1 from the styles list.
   * Click OK.
  JS error is thrown:
  {{{
  style._.definition.attributes is undefined
  /_source/plugins/div/dialogs/div.js L339
  }}}
  Regression of [5846].