merge with upstream

helix/constants/file_validation_error.py

@@ -49,3 +49,7 @@ class FileValidationError(object):
         if self.__class__ != other.__class__:
             return False
         return self.row_number == other.row_number and self.validation_message == other.validation_message
+
+class FileValidationException(Exception):
+    def __init__(self, message):
+        self.message = message