diff --git a/newspaper/extractors.py b/newspaper/extractors.py
index f91229d2..ec25b7d3 100644
--- a/newspaper/extractors.py
+++ b/newspaper/extractors.py
@@ -369,7 +369,9 @@ def get_meta_img_url(self, article_url, doc):
 
         top_meta_image = try_one or try_two or try_three or try_four
 
-        return urllib.parse.urljoin(article_url, top_meta_image)
+        if top_meta_image:
+            return urllib.parse.urljoin(article_url, top_meta_image)
+        return ''
 
     def get_meta_type(self, doc):
         """Returns meta type of article, open graph protocol
diff --git a/newspaper/parsers.py b/newspaper/parsers.py
index f81c7177..b30d5632 100644
--- a/newspaper/parsers.py
+++ b/newspaper/parsers.py
@@ -45,6 +45,8 @@ def css_select(cls, node, selector):
     def get_unicode_html(cls, html):
         if isinstance(html, str):
             return html
+        if not html:
+            return html
         converted = UnicodeDammit(html, is_html=True)
         if not converted.unicode_markup:
             raise Exception(
@@ -76,7 +78,8 @@ def clean_article_html(cls, node):
         article_cleaner.allow_tags = [
             'a', 'span', 'p', 'br', 'strong', 'b',
             'em', 'i', 'tt', 'code', 'pre', 'blockquote', 'img', 'h1',
-            'h2', 'h3', 'h4', 'h5', 'h6']
+            'h2', 'h3', 'h4', 'h5', 'h6',
+            'ul', 'ol', 'li', 'dl', 'dt', 'dd']
         article_cleaner.remove_unknown_tags = False
         return article_cleaner.clean_html(node)
 
@@ -85,7 +88,7 @@ def nodeToString(cls, node):
         """`decode` is needed at the end because `etree.tostring`
         returns a python bytestring
         """
-        return lxml.etree.tostring(node).decode()
+        return lxml.etree.tostring(node, method='html').decode()
 
     @classmethod
     def replaceTag(cls, node, tag):
diff --git a/newspaper/version.py b/newspaper/version.py
index 23245d84..9778534c 100644
--- a/newspaper/version.py
+++ b/newspaper/version.py
@@ -7,5 +7,5 @@
 __license__ = 'MIT'
 __copyright__ = 'Copyright 2014, Lucas Ou-Yang'
 
-version_info = (0, 1, 4)
+version_info = (0, 1, 5)
 __version__ = ".".join(map(str, version_info))
diff --git a/requirements.txt b/requirements.txt
index 9f7bc216..f40f012e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,7 +3,7 @@ Pillow==2.6.1
 PyYAML==3.11
 cssselect==0.9.1
 lxml==3.3.5
-nltk==3.0.0
+nltk==3.0.1
 requests==2.3.0
 six==1.7.3
 feedparser==5.1.3
diff --git a/setup.py b/setup.py
index 6433e830..082afbea 100755
--- a/setup.py
+++ b/setup.py
@@ -34,7 +34,7 @@
 
 setup(
     name='newspaper3k',
-    version='0.1.4',
+    version='0.1.5',
     description='Simplified python article discovery & extraction.',
     long_description=readme,
     author='Lucas Ou-Yang',