Add sanity check for yfinance at the start

app.py

@@ -12,6 +12,10 @@ from utils.fd_utils import calculate_fd_returns
 
 print("Starting the app")
 
+# Sanity check on the yfinance_utils
+print("Sanity check on the yfinance_utils")
+print(fetch_yfinance_daily("MSFT", "2020-01-01", "2020-01-03"))
+
 # Set page config
 st.set_page_config(page_title="Asset Class Comparison", layout="wide")