[Bugfix] fixed an NRE when event was changed from in channel to external or vice versa #2483
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This fixes a nre from my earlier contribution that occurred when an scheduled-event update audit log entry contained a change that changed the event type from internal to exernal. I forgot to handle the fact that channel ids and location names can actually have a null value (only one of them can actually have a non null value at the same time). Also there now is a way to differentiate between those values not having changed (the property is null in that case) and the value changing from/to a null value (the optional will be unset / the id will be 0).