Error while sync is running

[Espurna]

Steps to reproduce

Reported by client, not sure

Current behavior

The following error is rised

We’re sorry, but there seems to be an error…

Here is the full error message:

Display traceback as text

Traceback (innermost last):

     Module ZPublisher.Publish, line 138, in publish
     Module ZPublisher.mapply, line 77, in mapply
     Module ZPublisher.Publish, line 48, in call_object
     Module senaite.sync.browser.views, line 95, in __call__
     Module senaite.sync.updatestep, line 34, in run
     Module senaite.sync.updatestep, line 68, in _fetch_data

KeyError: 'count' 

Expected behavior

Do not crash

Screenshot (optional)

[juangallostra]

Closed as per #57