Description of problem:
when there's an empty value in drop-down, and you want to fill it in using keyboard, normal behavior is to use 'down arrow' key.
but since the empty value is last in the drop down list, only up key is acceptable.
Version-Release number of selected component (if applicable):
master (July 14th).
Steps to Reproduce:
1. open new cluster
2. focus/goto/put marker /on CPU Type (using tabs)
3. press down arrow key
should select first
Although I found it only for that, should be solved as part of infra.
this isn't related to the value in the drop-down being empty: the items in the drop-down are ordered; if you happen to be on the last item (empty or not), you cannot scroll "down" anymore; if you happen to be on the first item (empty or not), you cannot scroll "up" anymore. this is the built-in, normal drop-down behavior, and it should not be messed with.
I don't recall any other behavior in any other drop-down that I've seen.
if there is a specific problem in a specific drop down, and it makes sense that an empty item should be first, rather than last - that specific drop-down should change.