jobsub's list somewhat broken when searching with an owner name

Found a couple of problems with the list view in the Job Designer which uses this sort of URL:

http://hue.host:8088/jobsub/list/?noCache=1289555709277&owner=sam&name=Pi&

The problems are from the list_designs method in hue/apps/jobsub/src/jobsub/views.py which does:

  data = JobDesign.objects.order_by('-last_modified')
  owner = request.GET.get("owner")
  name = request.GET.get('name')
  if owner:
    try:
      user = User.objects.get(username=owner)
      data = data.filter(owner=user)
    except User.DoesNotExist:
      data = []
  else:
    owner = ""

  if name:
    data = data.filter(name__icontains=name)
  else:
    name = ''

The issues here are:

1. If the username is not fully valid and a name parameter is also specified, then having data = [] will not work because the code below is expecting data to be a QuerySet rather than a list. This could be fixed by having not do anything in the except block since data is already pointing at something valid.
2. The fact that one searches for a partial match while the other looks for an exact match is somewhat confusing. It would be nice if the user/owner search were instead just data = data.filter(owner_username_istartswith=owner)

Without testing it, I think that the above code could instead be:

  data = JobDesign.objects.order_by('-last_modified')
  owner = request.GET.get('owner', '')
  name = request.GET.get('name', '')
  if owner:
    data = data.filter(owner__username__istartswith=owner)
  if name:
    data = data.filter(name__icontains=name)