socksParentProxy via web interface

G'day,

I'm running polipo with a socksParentProxy, but sometimes I want to turn
it off. Unfortunately, polipo exits if I enter an empty socksParentProxy
in the web configuration interface.

Attached patch checks for this (I merely copied the conditions from
server.c).

-- 
--  Rogutės Sparnuotos

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diff -rN old-polipo-build/socks.c new-polipo-build/socks.c
123a124,131
>     if(socksParentProxy != NULL && socksParentProxy->length == 0) {
>         releaseAtom(socksParentProxy);
>         socksParentProxy = NULL;
>     }
>     
>     if(socksParentProxy == NULL)
>         return;
>