To reproduce i do this
1. Create a new netork
2. Click into the network and hosts->unattached
Uncaught exception occurred. Please try reloading the page. Details: (TypeError) : Cannot
read property 'N' of null
Please have your administrator check the UI logs
Only occurs on some environments. My problematic one has 3 hosts. In the error above, none
appear as unattached (or attached)