bug fixes

lib/pt_trading/results.py

@@ -417,7 +417,7 @@ class BacktestResult:
 
             # Print pair returns with disequilibrium information
             day_return = 0.0
-            if self.pairs_trades_[pair]:
+            if pair in self.pairs_trades_:
 
                 print(f"{pair}:")
                 pair_return = 0.0

lib/tools/data_loader.py

@@ -6,6 +6,12 @@ import pandas as pd
 
 
 def load_sqlite_to_dataframe(db_path:str, query:str) -> pd.DataFrame:
+    df: pd.DataFrame = pd.DataFrame()
+    import os
+    if not os.path.exists(db_path):
+        print(f"WARNING: database file {db_path} does not exist")
+        return df
+
     try:
         conn = sqlite3.connect(db_path)