fix pylint errors

backend/src/productors/exceptions.py

@@ -1,11 +1,17 @@
+import logging
+
+
 class ProductorServiceError(Exception):
     def __init__(self, message: str):
         super().__init__(message)
+        logging.error('ProductorService : %s', message)
+
 
 class ProductorNotFoundError(ProductorServiceError):
     pass
 
+
 class ProductorCreateError(ProductorServiceError):
     def __init__(self, message: str, field: str | None = None):
         super().__init__(message)
-        self.field = field
+        self.field = field