change instance method to extension method to gracefully cater for null args.
change instance method to extension method to gracefully cater for null args.

MindTouch/NServiceKit,timba/NServiceKit,ZocDoc/ServiceStack,NServiceKit/NServiceKit,NServiceKit/NServiceKit,ZocDoc/ServiceStack,MindTouch/NServiceKit,NServiceKit/NServiceKit,nataren/NServiceKit,nataren/NServiceKit,nataren/NServiceKit,MindTouch/NServiceKit,timba/NServiceKit,NServiceKit/NServiceKit,timba/NServiceKit,meebey/ServiceStack,nataren/NServiceKit,meebey/ServiceStack,ZocDoc/ServiceStack,ZocDoc/ServiceStack,MindTouch/NServiceKit,timba/NServiceKit