Allow None as a doctype tagname in lint

gsnedders · gsnedders · commit 9eff304ce8a2 · 2016-01-12T23:30:05.000+01:00
diff --git a/html5lib/filters/lint.py b/html5lib/filters/lint.py
@@ -80,8 +80,8 @@ def __iter__(self):
 
             elif type == "Doctype":
                 name = token["name"]
-                if not isinstance(name, text_type):
-                    raise LintError("Tag name is not a string: %(tag)r" % {"tag": name})
+                if name is not None and not isinstance(name, text_type):
+                    raise LintError("Tag name is not a string or None: %(tag)r" % {"tag": name})
                 # XXX: what to do with token["data"] ?
 
             elif type in ("ParseError", "SerializeError"):
