Fix try-except-raise for pylint 2.0

See https://github.com/PyCQA/pylint/issues/2302

qutebrowser/browser/qutescheme.py

@@ -187,8 +187,6 @@ def data_for_url(url):
     except OSError as e:
         # FIXME:qtwebengine how to handle this?
         raise QuteSchemeOSError(e)
-    except QuteSchemeError:
-        raise
 
     assert mimetype is not None, url
     if mimetype == 'text/html' and isinstance(data, str):

qutebrowser/config/configfiles.py

@@ -576,7 +576,7 @@ def read_autoconfig():
     """Read the autoconfig.yml file."""
     try:
         config.instance.read_yaml()
-    except configexc.ConfigFileErrors:
+    except configexc.ConfigFileErrors:  # pylint: disable=try-except-raise
         raise  # caught in outer block
     except configexc.Error as e:
         desc = configexc.ConfigErrorDesc("Error", e)