Update app.py

app.py

@@ -14,7 +14,11 @@ from openai import OpenAI
 import os
 from openai import OpenAI
 
-client = OpenAI(api_key=os.environ["OPENAI_API_KEY"])
+api_key = os.getenv("OPENAI_API_KEY")
+if not api_key:
+    raise RuntimeError("OPENAI_API_KEY environment variable not found.")
+client = OpenAI(api_key=api_key)
+
 
 import json
 from fpdf import FPDF