Update app.py

app.py

@@ -225,9 +225,9 @@ else:
 def get_start_index():
     if hf_fs.exists(output_repo_path + '/' + get_base_path()):
         files = hf_fs.ls(output_repo_path + '/' + get_base_path())
-        return len(files) -1
+        return len(files) #-1
     else:
-        return -1
+        return -2
 
 def read_data():
     with hf_fs.open(input_repo_path + '/' + to_annotate_file_name) as f: