Bugfix: timeout error crashing explorer

[ThomasRalee]

This PR:

• resolves discoveryError not resetting waitingResp flag, causing a Have already been sending a request loop.

[WARN] FabricGateway - Failed to send discovery request for channel Error: DiscoveryService has failed to return results
    at DiscoveryService.send (.../blockchain-explorer/node_modules/fabric-common/lib/DiscoveryService.js:370:10)
    at processTicksAndRejections (internal/process/task_queues.js:97:5)
...
[INFO] FabricGateway - Have already been sending a request
[INFO] FabricGateway - Have already been sending a request
[INFO] FabricGateway - Have already been sending a request
[INFO] FabricGateway - Have already been sending a request
[INFO] FabricGateway - Have already been sending a request

• resolves queryChainInfo timeout error killing explorer.

[ERROR] Sync - <<<<<<<<<<<<<<<<<<<<<<<<<< Synchronizer Error >>>>>>>>>>>>>>>>>>>>>
[ERROR] Sync - FabricError: Query failed. Errors: ["Error: REQUEST TIMEOUT"]
    at SingleQueryHandler.evaluate (.../blockchain-explorer/node_modules/fabric-network/lib/impl/query/singlequeryhandler.js:47:23)
    at processTicksAndRejections (internal/process/task_queues.js:97:5)
    at async Transaction.evaluate (.../blockchain-explorer/node_modules/fabric-network/lib/transaction.js:276:25)
[INFO] Sync - <<<<<<<<<<<<<<<<<<<<<<<<<< Closing client processor >>>>>>>>>>>>>>>>>>>>>
[DEBUG] FabricEvent - disconnectEventHubs()
[DEBUG] FabricEvent - disconnectChannelEventHub(defaultchannel)

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
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0.0% Duplication

[nekia]

Looks good to me.