keys error handling added

app.py

@@ -25,9 +25,9 @@ load_dotenv()
 We will load our environment variables here.
 """
 try:
-    HF_LLM_ENDPOINT = os.environ['HF_LLM_ENDPOINT']
-    HF_EMBED_ENDPOINT = os.environ['HF_EMBED_ENDPOINT']
-    HF_TOKEN = os.environ['HF_TOKEN']
+    HF_LLM_ENDPOINT = os.getenv('HF_LLM_ENDPOINT')
+    HF_EMBED_ENDPOINT = os.getenv('HF_EMBED_ENDPOINT')
+    HF_TOKEN = os.getenv('HF_TOKEN')
 except KeyError as e:
     raise EnvironmentError(f"Missing environment variable: {e}")