Reproducing steps:

1. have at least one host without any org/loc (update from console, register through puppet)
2. create new location
3. in step 2 select you want to choose "Manually assign"
4. click some host, clicking the green "Assign to Location"

The button does nothing, form is not submitted. It seems the submit is part of a wrong <form>. Also the button should not be green, it should be blue.