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/image.py

@@ -24,6 +24,7 @@ from .file import CapFile, BaseFile
 
 __all__ = ['BaseImage', 'CapImage']
 
+
 class _BaseImage(BaseFile):
     """
     Fake class to allow the inclusion of a BaseImage property within
@@ -31,6 +32,7 @@ class _BaseImage(BaseFile):
     """
     pass
 
+
 class BaseImage(_BaseImage):
     """
     Represents an image file.
@@ -61,6 +63,7 @@ class CapImage(CapFile):
     """
     Image file provider
     """
+
     def search_image(self, pattern, sortby=CapFile.SEARCH_RELEVANCE, nsfw=False):
         """
         search for an image file
@@ -83,4 +86,3 @@ class CapImage(CapFile):
         :rtype: :class:`BaseImage`]
         """
         return self.get_file(_id)
-