Correctly handle files that don't have numbering.xml but also have lists

CHANGELOG

@@ -1,11 +1,16 @@
 
 Changelog
 =========
+* 0.3.6
+    * It is possible for a docx file to not contain a `numbering.xml` file but
+      still try to use lists. Now if this happens all lists get converted to
+      paragraphs.
 * 0.3.5
     * Not all docx files contain a `styles.xml` file. We are no longer assuming
       they do.
 * 0.3.4
-    * It is possible for `w:t` tags to have `text` set to `None`. This no longer causes an error when escaping that text.
+    * It is possible for `w:t` tags to have `text` set to `None`. This no
+      longer causes an error when escaping that text.
 * 0.3.3
     * In the event that `cElementTree` has a problem parsing the document, a
       `MalformedDocxException` is raised instead of a `SyntaxError`

pydocx/tests/test_docx.py

@@ -735,6 +735,20 @@ def test_missing_style():
     ''')
 
 
+def test_missing_numbering():
+    file_path = path.join(
+        path.abspath(path.dirname(__file__)),
+        '..',
+        'fixtures',
+        'missing_numbering.docx',
+    )
+    actual_html = convert(file_path)
+    assert_html_equal(actual_html, BASE_HTML % '''
+    <p>AAA</p>
+    <p>BBB</p>
+    ''')
+
+
 def _converter(*args, **kwargs):
     # Having a converter that does nothing is the same as if abiword fails to
     # convert.

pydocx/utils.py

@@ -168,7 +168,9 @@ def __init__(
 
     def perform_pre_processing(self, root, *args, **kwargs):
         self._add_parent(root)
-        self._set_list_attributes(root)
+        # If we don't have a numbering root there cannot be any lists.
+        if self.numbering_root is not None:
+            self._set_list_attributes(root)
         self._set_table_attributes(root)
         self._set_is_in_table(root)