Merge pull request #5225 from tk0miya/5213_pyspecific

Fix #5213: i18n: sphinx-build crashes if node having tupled-attributed

sphinx/util/nodes.py

@@ -56,7 +56,10 @@ def repr_domxml(node, length=80):
        returns full of DOM XML representation.
     :return: DOM XML representation
     """
-    text = node.asdom().toxml()
+    try:
+        text = node.asdom().toxml()
+    except Exception:
+        text = text_type(node)
     if length and len(text) > length:
         text = text[:length] + '...'
     return text