Update app.py

app.py

@@ -357,7 +357,7 @@ class ImageAnalysisTool(Tool):
             encoded_image = base64.b64encode(image_bytes).decode('utf-8')
             
             # Get API key from environment
-            api_key = os.getenv('OPENAI_KEY', '')
+            api_key = os.getenv('OPENAI_KEY')
             if not api_key:
                 return "OpenAI API key not configured. Please add the OPENAI_API_KEY to your environment variables."