updated edge cases

app.py

@@ -51,7 +51,7 @@ def get_frames(video_in, trim_in):
 
 def change_model(model_slider, eventframe_files, mesh_files):                      
     if mesh_files is None:
-        return None, None
+        return None, None, None
         
     if model_slider >= len(mesh_files):
         model_slider = len(mesh_files)
@@ -66,7 +66,7 @@ def change_model(model_slider, eventframe_files, mesh_files):
 
 def infer(video_inp, trim_in, threshold):
     if video_inp is None:
-        return None, None, None
+        return None, None, None, None
     
     frames, fps = get_frames(video_inp, trim_in)
     ts_s = 1 / fps