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/capabilities/radio.py

@@ -35,10 +35,12 @@ class Radio(BaseObject):
     current =       Field('Current emission', StreamInfo)
     streams =       Field('List of streams', list)
 
+
 class CapRadio(Capability):
     """
     Capability of radio websites.
     """
+
     def iter_radios_search(self, pattern):
         """
         Search a radio.