Update app.py

app.py

@@ -23,9 +23,10 @@ if st.button('Update NEologd', help='It may take some time'):
 text = st.text_area("input", "麩菓子は、麩を主材料とした日本の菓子。")
 
 def make_row(word, kana_index=7, lemma_index=6):
-    ff = word.feature.split(",")
-    return dict(surface=word.surface, kana=ff[kana_index], lemma=ff[lemma_index], 
-            pos1=ff[0], pos2=ff[1], pos3=ff[2], pos4=ff[3])
+    # https://stackoverflow.com/a/49774255/5602117
+    ff = dict(enumerate(word.feature.split(",")))
+    return dict(surface=word.surface, kana=ff.get(kana_index), lemma=ff.get(lemma_index), 
+            pos1=ff.get(0), pos2=ff.get(1), pos3=ff.get(2), pos4=ff.get(3))
 
 """
 #### [mecab-ipadic-NEologd : Neologism dictionary for MeCab](https://github.com/neologd/mecab-ipadic-neologd)