Line breaks are sometimes lost when ignoreEmptyParagraph is set to false

[Wiktor Walc]

<br> tag is lost when the block element after line break is empty.

Steps to reproduce

• Set in CKEditor configuration ignoreEmptyParagraph to false
• Paste the following in source mode:

  <div>
  	First line</div>
  <br />
  <div>
  </div>
  

• Switch to wysiwyg mode, result:

  <div>
  	First line</div>
  <div>
  	&nbsp;</div>
  

Same things happens when <p> tag is used instead of <div>.