Fixed syntax error

Author: sassanh

oauth2_provider/oauth2_backends.py

@@ -180,7 +180,9 @@ def extract_body(self, request):
         """
         try:
             body = json.loads(request.body.decode("utf-8")).items()
-        except AttributeError, ValueError:
+        except AttributeError:
+            body = ""
+        except ValueError:
             body = ""
 
         return body