fix: handle error correctly with aiohttp upgrade

wallabag_api/wallabag.py

@@ -100,19 +100,19 @@ class Wallabag(object):
         json_data = {}
         if responses.status != 200:
             err_msg = HttpProcessingError(code=responses.status,
-                                          message=await responses.json())
+                                          message=str(await responses.json()))
             logging.error("Wallabag: aiohttp error {err_msg}".format(
                 err_msg=err_msg))
         else:
             try:
-                json_data = responses.json()
+                json_data = await responses.json()
             except ClientResponseError as e:
                 # sometimes json_data does not return any json() without
                 # any error. This is due to the grabbing URL which "rejects"
                 # the URL
                 logging.error("Wallabag: aiohttp error {code} {message}"
                               .format(code=e.code, message=e.message))
-        return await json_data
+        return json_data
 
     @staticmethod
     def __get_attr(what, type_attr, value_attr, **kwargs):