Datastore upload error

Hi,

I'm using CKAN 2.2 and the latest DataPusher master.
I'm trying to push a csv File with the following content:

``` csv
name;id;title;description;image_url;state
Group_1;;Erster Gruppe;;https://pbs.twimg.com/media/BxkP0jHIYAA8iFK.jpg;deleted
Group_2;;Zweite Gruppe;;https://pbs.twimg.com/media/BxkP0jHIYAA8iFK.jpg;deleted
Group_3;;Dritte Gruppe;;https://pbs.twimg.com/media/BxkP0jHIYAA8iFK.jpg;active
Group_4;;Vierte Gruppe;;https://pbs.twimg.com/media/BxkP0jHIYAA8iFK.jpg;deleted
Group_5;;Funfte Gruppe;;https://pbs.twimg.com/media/BxkP0jHIYAA8iFK.jpg;active
```

In the datapusher tab I only receive the following error:

```
Traceback (most recent call last):
File "/usr/lib/ckan/datapusher/lib/python2.7/site-packages/apscheduler/scheduler.py", line 512, in _run_job
retval = job.func(*job.args, **job.kwargs)
File "/home/vagrant/ckan/lib/datapusher/src/datapusher/datapusher/jobs.py", line 305, in push_to_datastore
delete_datastore_resource(resource_id, api_key, ckan_url)
File "/home/vagrant/ckan/lib/datapusher/src/datapusher/datapusher/jobs.py", line 129, in delete_datastore_resource
good_status=(201, 200, 404), ignore_no_success=True)
File "/home/vagrant/ckan/lib/datapusher/src/datapusher/datapusher/jobs.py", line 78, in check_response
if not ignore_no_success or json_response.get('success'):
AttributeError: 'unicode' object has no attribute 'get'
```

Any ideas how to fix this?