TimeoutExceptions cause Null reference exceptions

[jgoyvaerts]

When a timeout exception occurs when you refresh Queues or other top nodes, a null reference exception occurs as a result of incorrect nodes list removal (relayServiceListNode is attempted to be removed for queues, topics, event hubs and notification hubs)

[SeanFeldman]

Thank you @jgoyvaerts for catching this and sending a PR.
I took the liberty to update issue with details why the NullReference why taking place.

[paolosalvatori]

Thanks @jgoyvaerts

[PratikMSFT]

Customers has issue connecting through latest SB explorer version with 1000 entities in queues getting timeout, any options to tackle this problem please

[ErikMogensen]

@PratikMSFT , increase the Receive timeout setting and perhaps the Server timeout setting too in the View -> Options dialog.

In the next release the default settings for these are greatly increased.