GetBlock fails on blocks with trigger transactions

[netoneko]

Same as orbs-network/orbs-client-sdk-go#35

[netoneko]

Turns out, it does not fail. After truing to query block 2085540 from vchain 5110 on maiinet:

{
      transactions:
       [ { txHash: [Uint8Array],
           txId: [Uint8Array],
           protocolVersion: 1,
           virtualChainId: 5110,
           timestamp: 2020-02-03T15:08:25.774Z,
           signerPublicKey: undefined, // as it should be
           contractName: '_Triggers',
           methodName: 'trigger',
           inputArguments: [],
           executionResult: 'SUCCESS',
           outputArguments: [],
           outputEvents: [Array] } ] }
}