edit-hardware throws LookupError when adding previously absent hardware

[glennmatthews]

cot edit-hardware works fine when editing existing hardware types, but when attempting to create hardware of a type not previously present in an OVF, it errors out:

$ ./bin/cot edit-hardware COT/tests/minimal.ovf --cpus 1 -o test.ovf
Traceback (most recent call last):
  File "./bin/cot", line 64, in <module>
    COT.cli.main()
  File "./COT/cli.py", line 229, in main
    args.func(args)
  File "./COT/edit_hardware.py", line 77, in edit_hardware
    vm.set_cpu_count(args.cpus, args.profiles)
  File "./COT/ovf.py", line 734, in set_cpu_count
    profile_list)
  File "./COT/ovf.py", line 2261, in set_value_for_all_items
    .format(resource_type))
LookupError: No items of type cpu found!

[glennmatthews]

Fixed by 9ddec18