simplify duplication when no token given

app.py

@@ -104,7 +104,14 @@ print(f"loading model...")
 DEFAULT_CONFIG['cpu_offload'] = enable_cpu_offload # always use cpu offload if image generation is enabled
 DEFAULT_CONFIG['mode'] = "t2v"  # hardcoded since it is always cpu offloaded
 ovi_engine = OviFusionEngine()
-flux_model = DiffusionPipeline.from_pretrained("black-forest-labs/FLUX.1-Krea-dev", torch_dtype=torch.bfloat16)
+
+try:
+    flux_model = DiffusionPipeline.from_pretrained("black-forest-labs/FLUX.1-Krea-dev", torch_dtype=torch.bfloat16)
+    image_example = None
+except Exception as e:
+    flux_model = None
+    image_example = "example_prompts/pngs/8.png"
+    
 print("loaded model")
 
 
@@ -183,6 +190,9 @@ def generate_scene(
     if not text_prompt_processed:
         raise gr.Error("Please enter a prompt.")
     
+    if not flux_model and not image:
+        raise gr.Error("Please provide an image")
+    
     if session_id is None:
         session_id = uuid.uuid4().hex
     
@@ -390,7 +400,7 @@ with gr.Blocks(css=css, theme=theme) as demo:
                         [
                             "The video opens with a close-up of a woman with vibrant reddish-orange, shoulder-length hair and heavy dark eye makeup. She is wearing a dark brown leather jacket over a grey hooded top. She looks intently to her right, her mouth slightly agape, and her expression is serious and focused. The background shows a room with light green walls and dark wooden cabinets on the left, and a green plant on the right. She speaks, her voice clear and direct, saying, <S>doing<E>. She then pauses briefly, her gaze unwavering, and continues, <S>And I need you to trust them.<E>. Her mouth remains slightly open, indicating she is either about to speak more or has just finished a sentence, with a look of intense sincerity.. <AUDCAP>Tense, dramatic background music, clear female voice.<ENDAUDCAP>", 
                             50,
-                            None,
+                            f"{image_example}",
                         ],
 
                         [