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bug: discards connections if user,pass empty but non NULL; possible FIX

1

The caller may set the user/pass flag to "present" but can meantime pass strings with just \0 so basically empty, even if non NULL. This happens for example when you...

myBroker.off() this is needed to turn it off and clear memory. This is for having this Broker optionally on and off. for myBroker.init() or init(port) (that would turn it back...

When I had it not accepting external subscription in #40 , free heap was 34K. With DoorOpen subscripting one topic, mosquito on PC subscribing same topic, and ESP-with-broker itself subscribed...