Error when deleting newline/paragraph

[cutteroid]

Error in console and incorrect text caret position after newline/paragraph deletion

Steps for Reproduction

1. Visit editor page
2. Run in console
   quill.pasteHTML("<p><br></p><p>test</p>");
3. Put text cursor on the end of first paragraph (optionally type some symbols) and hit DEL

Expected behavior:
newline correctly removed and cursor position preserved.

Actual behavior:
if first paragraph has text - newline removed but cursor position shifted
if there no text in first paragraph - newline removed with error in console

quill.js:5506 Uncaught IndexSizeError: Failed to execute 'setStart' on 'Range': The offset -1 is larger than or equal to the nodes length (4).

Platforms: Firefox 47, Firefox 49.0a2 and Chrome 51.0.2704.106 on OS X

Version: 1.0.0-beta.9