Create a course. Visit Users -> Groups. Create a group with no group image and no description. Create a group with a group image and with no description. Create a group with no group image and a description. Create a group with a group image and a description. Click on the group name and click 'Add/remove users' for each group. Check there is no empty row displayed (see screenshots) for the first group, and for the others that the information is displayed correctly.