feat: Return signals from scanner functions and handle errors

src/screener/t_atr_ema.py

@@ -99,6 +99,8 @@ def run_atr_ema_scanner(min_price: float, max_price: float, min_volume: int,
                 continue
         
         save_signals_to_csv(bullish_signals, 'atr_ema')
+        return bullish_signals
             
     except Exception as e:
         print(f"Error during scan: {str(e)}")
+        return []

src/screener/t_atr_ema_v2.py

@@ -107,6 +107,8 @@ def run_atr_ema_scanner_v2(min_price: float, max_price: float, min_volume: int,
                 continue
         
         save_signals_to_csv(entry_signals, 'atr_ema_v2')
+        return entry_signals
             
     except Exception as e:
         print(f"Error during scan: {str(e)}")
+        return []

src/screener/t_sunnyband.py

@@ -244,6 +244,8 @@ def run_sunny_scanner(min_price: float, max_price: float, min_volume: int,
                 continue
         
         save_signals_to_csv(bullish_signals, 'sunny')
+        return bullish_signals
             
     except Exception as e:
         print(f"Error during scan: {str(e)}")
+        return []