unhandled error in opencorpora.reader

[kmike]

Из pymorphy2/pymorphy2#48:

kdruzhkin@Rhodos:~$ ipython
In [1]: import opencorpora
In [2]: corpus = opencorpora.CorpusReader('annot.opcorpora.xml')
In [3]: tws = corpus.iter_tagged_words()
In [4]: for tw in tws: pass
---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-6-58b1ffe6da49> in <module>()
----> 1 for tw in x: pass

/usr/local/lib/python3.4/dist-packages/opencorpora/reader.py in _doc_iterator(self, fileids, categories, doc_method)
    214         for doc in self.iter_documents(fileids, categories, _destroy=True):
    215             meth = getattr(doc, doc_method)
--> 216             for res in meth():
    217                 yield res
    218 

/usr/local/lib/python3.4/dist-packages/opencorpora/reader.py in iter_tagged_words(self)
    110 
    111     def iter_tagged_words(self):
--> 112         return itertools.chain(*self.iter_tagged_sents())
    113 
    114     def iter_parsed_words(self):

/usr/local/lib/python3.4/dist-packages/opencorpora/reader.py in _sentence_tagged_words(sent_elem)
     37         text = text_type(tok.get('text'))
     38         parse = tok.find('*//l')
---> 39         tag = text_type(',').join(_grammemes(parse))
     40         res.append((text, tag))
     41     return res

/usr/local/lib/python3.4/dist-packages/opencorpora/reader.py in _grammemes(l_element)
     55 def _grammemes(l_element):
     56     return [text_type(grammeme.get('v'))
---> 57             for grammeme in l_element.getchildren()]
     58 
     59 

AttributeError: 'NoneType' object has no attribute 'getchildren'