finish_starttag():  Make sure we do not close too many levels; this was
    possible with some interactions between nested tables.

lib/python/TAL/HTMLTALParser.py

@@ -191,6 +191,7 @@ class HTMLTALParser(HTMLParser):
             for i in range(len(self.tagstack)):
                 t = self.tagstack[i]
                 if t in blocks_to_close:
+                    if close_to == -1:
                         close_to = i
                 elif t in BLOCK_LEVEL_HTML_TAGS:
                     close_to = -1