Style fixes for flake8

Signed-off-by: Maxime Petazzoni <max@signalfuse.com>

docker/client.py

@@ -276,10 +276,9 @@ class Client(requests.Session):
             if not length:
                 break
             data = recvall(socket, length)
-            if data:
-                yield data
-            else:
+            if not data:
                 break
+            yield data
 
     def attach(self, container):
         socket = self.attach_socket(container)

tests/integration_test.py

@@ -274,6 +274,7 @@ class TestLogs(BaseTestCase):
         logs = self.client.logs(id)
         self.assertEqual(logs, snippet + '\n')
 
+
 class TestLogsStreaming(BaseTestCase):
     def runTest(self):
         snippet = 'Flowering Nights (Sakuya Iyazoi)'
@@ -292,6 +293,7 @@ class TestLogsStreaming(BaseTestCase):
 
         self.assertEqual(logs, snippet + '\n')
 
+
 class TestLogsWithDictInsteadOfId(BaseTestCase):
     def runTest(self):
         snippet = 'Flowering Nights (Sakuya Iyazoi)'