Allowed empty constructor, added updateClient() method. #364
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I had a situation needing to create the constructor without passing in the parameters.
I did the slight changes to allow your code to work flawlessly with that situation; added an empty constructor definition; added an updateClient() method; made sure 'client' exists when doing client->method calls. That's it.
This change is a drop-in replacement, and all prior code will be 100% compatible.