Verify whether the backtest result data frame contains data before attempting to drop the cumulative profit column

run_backtest.py

@@ -50,6 +50,8 @@ def run_backtest(start_date: datetime, end_date: datetime):
             start_date, 
             end_date
         )
+        
+        if not backtest_results.empty:
             # TODO: Think of a better way to handle this.
             backtest_results.drop('Cumulative Profit', axis = 1, inplace = True)
             print(backtest_results)