rem: catch (e) {} return null; 
add: catch (e) { dnsResolveCachedIp = null; } return dnsResolveCachedIp; 
context: function dnsResolve(host) {    try {        var ip = dns.resolve(host);        return ip;    }    catch (e) {}    return null;}
meta: 5872	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5872/c75f83945ea261ffa9f119b0c8e7a3d88b1a79aa/nsProxyAutoConfig.js/clean/netwerk/base/src/nsProxyAutoConfig.js