Check for tagName attr before checking script tag

- Added a comment node to example.html to ensure non-failure in test

Author: tweekmonster

microdata.py

@@ -209,7 +209,7 @@ def _text(e):
     chunks = []
     if e.nodeType == e.TEXT_NODE:
         chunks.append(e.data)
-    elif e.tagName == 'script':
+    elif hasattr(e, 'tagName') and e.tagName == 'script':
         return ''
     for child in e.childNodes:
         chunks.append(_text(child))

test-data/example.html

@@ -15,6 +15,7 @@
         <span itemprop="streetAddress">
           20341 Whitworth Institute
           405 N. Whitworth
+          <!-- Comment Node -->
           <script>
             // Unrelated text
           </script>