[FIX] summernote: raise when create a range to target like an image or a br

[FIX] summernote: raise when create a range to target like an image or a br

1) browsers (eg: IE) raise when create a range to target a node like an image or a br;
2) createFromNode can't select a node with more or less of one item. For eg: <div>text <span>one</span></div> the range selected is only 'text '