User contribution table not generating correctly

The weekly contribution table is not generating when you go to the calendar and change the date range.

Steps to Reproduce:

• Login to zanata.
• Go to Profile.
• Click on the date changer and select a month or so.
• Select translated (assuming you have some contributions marked translated).
• Observe that there is no table under 'Last month's activity'

Actual Result

• No contribution table shows. In some cases, the buttons for disabled days will show (see userprofile2.png)

Expected Result:

• Contribution table should be visible and work correctly

Note:

• Attached screenshots for more ref.