Hello all,
Fixed bug 516 from trac...  I didn't see a fix anywhere out there.
cpforbes originally started on this; thought I'd finish it.

git://github.com/gordonchil/cobbler.git
the branch it's under is 'trac516'

I added this to web/cobbler_web/views.py - generic_save
# Multiselect fields are handled differently
if field["html_element"] == "multiselect":
    values=request.POST.getlist(field['name'])
    value=[]
    for single_value in values:
        if single_value != "<<None>>":
            value.insert(0,single_value)