fixup! Placate pyflakes.

gsnedders · gsnedders · commit e3786381a3c5 · 2013-04-27T13:23:58.000+01:00
diff --git a/html5lib/treebuilders/etree.py b/html5lib/treebuilders/etree.py
@@ -207,8 +207,12 @@ def serializeElement(element, indent=0):
                     rv.append("<!DOCTYPE %s>" % (element.text,))
             elif element.tag == "DOCUMENT_ROOT":
                 rv.append("#document")
-                assert element.text is None
-                assert element.tail is None
+                if element.text is not None:
+                    raise TypeError("Document node cannot have text")
+                if element.tail is not None:
+                    raise TypeError("Document node cannot have tail")
+                if hasattr(element, "attrib") and len(element.attrib):
+                    raise TypeError("Document node cannot have attributes")
             elif element.tag == ElementTreeCommentType:
                 rv.append("|%s<!-- %s -->" % (' ' * indent, element.text))
             else:
