Update app.py

app.py

@@ -83,7 +83,8 @@ def inference(query):
                   ]
         a_table.append(record)
 
-    del j_bucket['None']
+    if j_bucket['None']:
+        del j_bucket['None']
     j_table = sorted([[journal, round(score, 3)] for journal,
                      score in j_bucket.items()],
                      key=lambda x: x[1], reverse=True)