Make the `start-after and end-before options to the literalinclude` directive work correctly if not used together.

tests/root/includes.txt

@@ -44,6 +44,12 @@ Literalinclude options
    :start-after: coding: utf-8
    :end-before: class Foo
 
+.. literalinclude:: literal.inc
+   :start-after: utf-8
+
+.. literalinclude:: literal.inc
+   :end-before: class Foo
+
 Test if dedenting before parsing works.
 
 .. highlight:: python

tests/test_markup.py

@@ -16,7 +16,6 @@ from util import *
 from docutils import frontend, utils, nodes
 from docutils.parsers import rst
 
-from sphinx import addnodes
 from sphinx.util import texescape
 from sphinx.writers.html import HTMLWriter, SmartyPantsHTMLTranslator
 from sphinx.writers.latex import LaTeXWriter, LaTeXTranslator