Update app.py

app.py

@@ -84,7 +84,7 @@ def generate(prompt, quality_tags, neg_prompt, seed, scale, width, height, steps
         smea, dyn, dyn_threshold, cfg_rescale
     )
     if not isinstance(img_data, bytes):
-        return None, payload
+        return gr.Image(value=None, height=100), payload
     today_count += 1
     img = image_from_bytes(img_data)
     
@@ -93,10 +93,8 @@ def generate(prompt, quality_tags, neg_prompt, seed, scale, width, height, steps
 
 def preview_ui():
     with gr.Blocks(css='#preview_image { height: 100%;}') as page:
-        image = gr.Image(elem_id='preview_image', interactive=False, height=1200)
-        h_slider = gr.Slider(label='Height', value=500, minimum=100, maximum=1200, step=10)
+        image = gr.Image(elem_id='preview_image', interactive=False)
         info = gr.JSON(value={}, label="Submitted Payload")
-    h_slider.change(lambda h: gr.Image(height=h), h_slider, image)
     return image, info