Add missing classmethod

Author: itziakos

haas/plugins/result_handler.py

@@ -93,6 +93,10 @@ def from_args(cls, args, name, dest_prefix, test_count):
         if args.verbosity == 0:
             return cls(test_count=test_count)
 
+    @classmethod
+    def add_parser_arguments(self, parser, name, option_prefix, dest_prefix):
+        pass
+
     def get_test_description(self, test):
         return get_test_description(test, descriptions=self.descriptions)