Ignore anchor tags with no href attribute

2 files changed, 18 insertions, 2 deletions

diff --git a/mammoth/writers/markdown.py b/mammoth/writers/markdown.py
index 66bc9f2..771874c 100644
--- a/mammoth/writers/markdown.py
+++ b/mammoth/writers/markdown.py
@@ -18,7 +18,10 @@ class _Wrapped(object):
 
 def _hyperlink(attributes):
     href = attributes.get("href", "")
-    return "[", "]({0})".format(href)
+    if href:
+        return "[", "]({0})".format(href)
+    else:
+        return _default_output
 
 
 def _init_writers():
@@ -37,7 +40,8 @@ def _init_writers():
 
 
 _writers = _init_writers()
-_default_writer = lambda attributes: ("", "")
+_default_output = ("", "")
+_default_writer = lambda attributes: _default_output
 
 
 class MarkdownWriter(object):
@@ -49,6 +53,9 @@ class MarkdownWriter(object):
         self._fragments.append(_escape_markdown(text))
     
     def start(self, name, attributes=None):
+        if attributes is None:
+            attributes = {}
+        
         start, end = _writers.get(name, _default_writer)(attributes)
         self._fragments.append(start)
         self._element_stack.append(end)
diff --git a/tests/writers/markdown_tests.py b/tests/writers/markdown_tests.py
index bfa1e1b..9448b50 100644
--- a/tests/writers/markdown_tests.py
+++ b/tests/writers/markdown_tests.py
@@ -85,6 +85,15 @@ def anchor_tags_are_written_as_hyperlinks():
     assert_equal("[Hello](http://example.com)", writer.as_string())
     
 
+@istest
+def anchor_tags_without_href_attribute_are_treated_as_ordinary_text():
+    writer = _create_writer()
+    writer.start("a");
+    writer.text("Hello");
+    writer.end("a");
+    assert_equal("Hello", writer.as_string())
+    
+
 
 def _create_writer():
     return MarkdownWriter()