avoid words that would be None when indexing
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@ -74,7 +74,7 @@ class DmsKeyword(Item):
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except KeyError:
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continue
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words.append(keyword.get_words_for_indexation(limit=limit-1))
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return ' '.join(words)
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return ' '.join([x for x in words if x])
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def get_keyword_tree(self, limit=5):
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thesaurus = aq_parent(self)
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