[format.python] initial formatting of the python code

This patch was generated by black [1]::

    make format.python

[1] https://github.com/psf/black

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

searx/exceptions.py

@@ -21,7 +21,6 @@ class SearxException(Exception):
 
 
 class SearxParameterException(SearxException):
-
     def __init__(self, name, value):
         if value == '' or value is None:
             message = 'Empty ' + name + ' parameter'