Cannot see "ungrouped devices" in mender server 2.4.0 beta.1

@mirzak @mzedel
We at Palo Alto Innovation see the lack of ungrouped devices as a major problem in 2.4.0 beta 1. We’ve survived it so far but it makes it impossible to quickly find new devices and add them to groups. I really hope you guys can fix this for 2.4.0.

–Cameron