Hello!
I recently had a use-case that needed me to start using the text mining tools for a reporting based workflow, and i had pretty good success. However, my workflow does not always have data being brought through it, and when 0 results are supplied to a Text Pre-processing tool, it produces a bug and log file. I imagine this is a small fix, just a weird one to run into.
Steps to replicate:
1- Add a text input tool with some dummy text values as part of a field
2- Add a text pre-processing tool to the workflow, and configure it to use this field and English.
3- add a filter tool, prior to the text pre-processing tool, to filter out any valid results
4- Run the workflow
As the data cleansing tool does not behave similar, I fully believe this to be an unintended outcome.