fix(client): remove check for error message

This check was originally used for API/client version mismatches, but
breaks when the response is not as to be expected. The client response
works, anyways:

    ><> deis apps
    405 METHOD NOT ALLOWED
    {u'error': u'Client and server versions do not match.\nClient version: 0.10\nServer version: 0.11'}

Author: Matthew Fisher

client/deis.py

@@ -377,10 +377,6 @@ def _dispatch(self, method, path, body=None, **kwargs):
                 'No active controller. Use `deis login` or `deis register` to get started.')
         url = urlparse.urljoin(controller, path, **kwargs)
         response = func(url, data=body, headers=headers)
-        # check for errors
-        if response.json().get('error') is not None:
-            print(response.json()['error'])
-            sys.exit(1)
         return response
 
     def apps(self, args):