Unhandled error events

[pedrofrancescon]

After the update to version 1.1.1, to include events propagation to node-red-contrib-df1-gateway, those kind of warning messages are often appearing:

(node:4281) UnhandledPromiseRejectionWarning: Error [ERR_UNHANDLED_ERROR]: Unhandled error. (undefined)
     at DF1Endpoint.emit (events.js:364:17)
     at DF1Endpoint.Node.emit (/opt/st-one-node-red/node-red/node_modules/@node-red/runtime/lib/nodes/Node.js:185:20)
     at onError (/home/node-red/node_modules/node-red-contrib-df1/red/df1.js:306:18)
     at /home/node-red/node_modules/node-red-contrib-df1/red/df1.js:150:21
     at runNextTicks (internal/process/task_queues.js:60:5)
     at listOnTimeout (internal/timers.js:526:9)
     at processTimers (internal/timers.js:500:7)

We should think of better approaches to avoid those messages.