Fix lint errors

Author: vimalloc-mavenlink

flask_jwt_extended/internal_utils.py

@@ -12,7 +12,7 @@ def get_jwt_manager():
         raise RuntimeError(
             "You must initialize a JWTManager with this flask "
             "application before using this method"
-        )
+        ) from None
 
 
 def has_user_lookup():

flask_jwt_extended/view_decorators.py

@@ -248,7 +248,9 @@ def _decode_jwt_from_json(refresh):
         if not encoded_token:
             raise BadRequest()
     except BadRequest:
-        raise NoAuthorizationError('Missing "{}" key in json data.'.format(token_key))
+        raise NoAuthorizationError(
+            'Missing "{}" key in json data.'.format(token_key)
+        ) from None
 
     return encoded_token, None