Ignore containers that don't have a name

If a container is in the process of being removed, or removal has
failed, it can sometimes appear in the output of GET /containers/json
but not have a 'Name' key. In that case, rather than crashing, we can
ignore it.

Signed-off-by: Aanand Prasad <aanand.prasad@gmail.com>

compose/project.py

@@ -310,11 +310,11 @@ class Project(object):
         else:
             service_names = self.service_names
 
-        containers = [
+        containers = filter(None, [
             Container.from_ps(self.client, container)
             for container in self.client.containers(
                 all=stopped,
-                filters={'label': self.labels(one_off=one_off)})]
+                filters={'label': self.labels(one_off=one_off)})])
 
         def matches_service_names(container):
             return container.labels.get(LABEL_SERVICE) in service_names