don't lemmatize word to empty string

nournia · nournia · commit 9ce9b58d1c78 · 2014-08-28T17:46:24.000+04:30
diff --git a/hazm/Lemmatizer.py b/hazm/Lemmatizer.py
@@ -49,7 +49,7 @@ def lemmatize(self, word, pos=''):
 			return word
 
 		stem = self.stemmer.stem(word)
-		if stem in self.words:
+		if stem and stem in self.words:
 			return stem
 
 		return word
