nextmatch select box filters value array isn't stored in namespace, they are just stored in $sel_options

This creates problem when multiple nextmatchs are used one one page (or in tabs) and you want the same filter (ie accounts) but with a different null display (ie you want one filter to include 'Show all..' and another filter does not)

I discovered this problem with a custom nextmatch template based on the template for the default nextmatch widget but it seems to apply to the default nextmatches too