Update app.py

app.py

@@ -57,7 +57,7 @@ def get_tree(imgpath):
         if os.path.isdir(os.path.join(imgpath, foldername)):
             folderpath = os.path.join(imgpath, foldername)
             node_name = foldername
-            child_names = [filename.split('.')[0].split('-')[0] for filename in os.listdir(folderpath)]
+            child_names = list(set([filename.split('.')[0].split('-')[0] for filename in os.listdir(folderpath)]))
 
             if node_name in name_to_node:
                 node = name_to_node[node_name]