pep8 blank lines fixes

flake8 --select W391,E302,E301,E304

autopep8 can't fix W391 even though it claims it can.
Fixed using a simple custom script.

weboob/deprecated/browser/parsers/lxmlparser.py

@@ -109,6 +109,7 @@ class LxmlHtmlParser(LxmlParser):
 
     Note that it is not available on every systems.
     """
+
     def __init__(self, *args, **kwargs):
         self.module = html
 
@@ -122,6 +123,7 @@ class LxmlXmlParser(LxmlParser):
 
     Note that it is not available on every systems.
     """
+
     def __init__(self, *args, **kwargs):
         self.module = etree