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/tools/application/formatters/table.py

@@ -100,6 +100,7 @@ class TableFormatter(IFormatter):
 class HTMLTableFormatter(TableFormatter):
     HTML = True
 
+
 def test():
     from .iformatter import formatter_test_output as fmt
     assert fmt(TableFormatter, {'foo': 'bar'}) == \