Update app.py

app.py

@@ -16,7 +16,9 @@ MediaTek Research Breeze-7B (hereinafter referred to as Breeze-7B) is a language
 [Breeze-7B-Base](https://huggingface.co/MediaTek-Research/Breeze-7B-Base-v1_0) is the base model for the Breeze-7B series. 
 It is suitable for use if you have substantial fine-tuning data to tune it for your specific use case.
 [Breeze-7B-Instruct](https://huggingface.co/MediaTek-Research/Breeze-7B-Instruct-v1_0) derives from the base model Breeze-7B-Base, making the resulting model amenable to be used as-is for commonly seen tasks.
+
 This App is cloned from [Demo-MR-Breeze-7B](https://huggingface.co/spaces/MediaTek-Research/Demo-MR-Breeze-7B)
+
 """
 
 LICENSE = """
@@ -81,6 +83,14 @@ def refusal_condition(query):
     return False
 
 with gr.Blocks() as demo:
+    # Check if the API_URL and TOKEN are set
+    if API_URL is None:
+        gr.Error("API_URL is not set as an environment variable.")
+    if TOKEN is None:
+        gr.Error("TOKEN is not set as an environment variable.")
+    if MODEL_NAME is None:
+        gr.Error("MODEL_NAME is not set as an environment variable.")
+
     gr.Markdown(DESCRIPTION)
 
     system_prompt = gr.Textbox(label='System prompt',