Improve code coverage · neo-project/neo@5bede19

Converting null literal or possible null value to non-nullable type.

Possible null reference argument for parameter 'ret' in 'void MainService.OnBroadcastCommand(MessageCommand command, ISerializable ret)'.

Converting null literal or possible null value to non-nullable type.

Dereference of a possibly null reference.

Converting null literal or possible null value to non-nullable type.

Possible null reference argument for parameter 'ret' in 'void MainService.OnBroadcastCommand(MessageCommand command, ISerializable ret)'.

Converting null literal or possible null value to non-nullable type.

Dereference of a possibly null reference.

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