Don't expect parser model

spacy/syntax/parser.pyx

@@ -80,6 +80,7 @@ cdef class ParserModel(AveragedPerceptron):
 cdef class Parser:
     @classmethod
     def load(cls, path, Vocab vocab, moves_class):
+        if (path / 'config.json').exists():
             with (path / 'config.json').open() as file_:
                 cfg = json.load(file_)
         moves = moves_class(vocab.strings, cfg['labels'])