no stock data available error message

app.py

@@ -303,6 +303,10 @@ class TradingApp:
     def display_charts(self):
         # Dynamically adjust columns based on number of stocks and available width
         symbols = list(self.data.keys())
+        if not symbols:
+            st.warning("No stock data available to display charts.")
+            return  # Exit the function if no symbols are available
+
         symbol_to_name = self.analyzer.symbol_to_name
         n = len(symbols)
         # Calculate columns based on n for best fit