add empty checkbox check at the finish button click

app.py

@@ -101,18 +101,18 @@ def main():
             count = state if isinstance(state, int) else state.value
             return f"### Target class: {class_names[count]}"
 
-        def update_buttons(state):
+        def update_buttons():
+            submit_button = gr.Button("Submit", visible=False)
+            continue_button = gr.Button("Continue", visible=True)
+            return continue_button, submit_button
+
+        def update_continue_button(state):
             count = state if isinstance(state, int) else state.value
             max_images = config['dataset'][config['dataset']['name']]['n_classes']
             finish_button = gr.Button("Finish", visible=(count == max_images-1))
-            submit_button = gr.Button("Submit", visible=False)
-            continue_button = gr.Button("Continue", visible=(count != max_images-1))
-            return continue_button, submit_button, finish_button
-
-        def update_continue_button():
+            submit_button = gr.Button("Submit", visible=(count != max_images-1))
             continue_button = gr.Button("Continue", visible=False)
-            submit_button = gr.Button("Submit", visible=True)
-            return continue_button, submit_button
+            return continue_button, submit_button, finish_button
 
 
         def update_checkbox(user_state):
@@ -211,8 +211,7 @@ def main():
             outputs=target_img_label
         ).then(
             update_buttons,
-            inputs=user_state,
-            outputs={continue_button, submit_button, finish_button}
+            outputs={continue_button, submit_button}
         ).then(
             hide_checkbox,
             outputs=concept_checkboxes
@@ -228,7 +227,8 @@ def main():
 
         continue_button.click(
             update_continue_button,
-            outputs={continue_button, submit_button}
+            inputs=user_state,
+            outputs={continue_button, submit_button, finish_button}
         ).then(
             update_checkbox,
             inputs=user_state,
@@ -236,6 +236,13 @@ def main():
         )
        
         finish_button.click(
+            check_answer, 
+            inputs=concept_checkboxes
+        ).success(
+            update_state,
+            inputs=user_state,
+            outputs=user_state
+        ).then(
             add_answer, inputs=[concept_checkboxes, answers],outputs=answers
         ).then(
             save_results, inputs=answers