Update app.py

app.py

@@ -475,7 +475,8 @@ def create_index():
                 try:
                     if k in ind[0].keys():
                         print("Adding to list")
-                        ind[0][k].append(ea['file_name'])
+                        if not ea['file_name'] in ind[0][k]:
+                            ind[0][k].append(ea['file_name'])
                     else:
                         print("Adding new Value")
                         ind[0].update({k:[ea['file_name']]})