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/browser.py

@@ -69,6 +69,7 @@ class NoHistory(object):
     """
     We don't want to fill memory with history
     """
+
     def __init__(self):
         pass
 
@@ -703,6 +704,7 @@ class DNSTimeoutException(Exception):
 
 cacheDNS = {}
 
+
 def my_getaddrinfo(*args):
     try:
         res, timeout = cacheDNS[args]