Posting status to a measurement with exception message when exception is thrown out of node

The plugin generates a lot of junk when any command generates exception out of node construction. It is creating a measurement with an exception message instead of writing to `job` or `stage` measurement.

Steps to reproduce:
1. Configure connection to InfluxDB
2. Crete a pipeline job
3. Generate an exception not wrapping it in `node() {...}` or `stage() {...}`
4. The plugin creates a measurement with the name of exception message