Fixed jpadilla#183 AttributeError: 'NoneType' object has no attribute 'rsplit'

The issue also occurs when payload is int raising:
    AttributeError: 'int' object has no attribute 'rsplit'
Test for None and int payload added

Author: maoaiz

jwt/api_jws.py

@@ -138,6 +138,9 @@ def _load(self, jwt):
         try:
             signing_input, crypto_segment = jwt.rsplit(b'.', 1)
             header_segment, payload_segment = signing_input.split(b'.', 1)
+        except AttributeError:
+            raise DecodeError('Invalid payload type. It should be a {} not {}'.format(
+                text_type, type(jwt)))
         except ValueError:
             raise DecodeError('Not enough segments')
 

tests/test_api_jws.py

@@ -122,6 +122,24 @@ def test_decode_missing_segments_throws_exception(self, jws):
         exception = context.value
         assert str(exception) == 'Not enough segments'
 
+    def test_decode_invalid_payload_type_is_none(self, jws):
+        example_jws = None
+        example_secret = 'secret'
+
+        with pytest.raises(DecodeError) as context:
+            jws.decode(example_jws, example_secret)
+
+        assert 'Invalid payload type' in str(context.value)
+
+    def test_decode_invalid_payload_type_is_int(self, jws):
+        example_jws = 123
+        example_secret = 'secret'
+
+        with pytest.raises(DecodeError) as context:
+            jws.decode(example_jws, example_secret)
+
+        assert 'Invalid payload type' in str(context.value)
+
     def test_decode_with_non_mapping_header_throws_exception(self, jws):
         secret = 'secret'
         example_jws = ('MQ'  # == 1