Exit blockly processing
Sometimes it is required to exit the Blockly processing: under certain circumstances, the remaining of the blocks shouldn't be executed anymore. Node-RED allows you to exit and send an output message in a single statement.
The following animation shows how accomplish those steps:
- At the start a warning 'processing started' need to be logged.
- Then the processing should stop, and the input message needs to be send to the output.
- The last warning 'processing ended' should **_not _**be logged, since the processing has ended in the previous step.
