The filter in the plotter does not work

[frode-aarstad]

Describe the bug Pressing the filter and selecting an type IE GEN_KW causes exceptions in the console

To reproduce Steps to reproduce the behaviour:

1. pip install ert
2. ert gui my_config.ert
3. Run experiment (IES/Smoother/ESMDA/Test)
4. Click "create plot"
5. Select one data type IE GEN_KW
6. Check the log for exceptions

Expected behaviour Filter should work No exceptions

Screenshots

Environment

• OS: [e.g. RHEL7]
• ERT/Komodo release: [e.g. 2.18 or 2020.12.00]
• Python version
• Remote/HPC execution involved: [yes|no]

Additional context Add any other context about the problem here.