[GSK-1770] Fix text explanation for regression model

[Inokinoki]

Description

Related Issue

Type of Change

• 📚 Examples / docs / tutorials / dependencies update
• 🔧 Bug fix (non-breaking change which fixes an issue)
• 🥂 Improvement (non-breaking change which improves an existing feature)
• 🚀 New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to change)
• 🔐 Security fix

Checklist

• I've read the CODE_OF_CONDUCT.md document.
• I've read the CONTRIBUTING.md guide.
• I've updated the code style using make codestyle.
• I've written tests for all new methods and classes that I created.
• I've written the docstring in Google format for all the methods and classes that I used.

[linear]

GSK-1770 model explanation is breaking for hotel text regression on demo instance

Sep 20 13:58:21 ns3031812 python[418761]: 2023-09-20 13:58:21,240 pid:418761 Thread-4349 (dispatch_action) giskard.ml_worker.utils.logging INFO     giskard.models.model_explanation.explain_text executed in 0:00:00.673506
Sep 20 13:58:21 ns3031812 python[418761]: 2023-09-20 13:58:21,241 pid:418761 Thread-4349 (dispatch_action) giskard.ml_worker.websocket.listener WARNING  'NoneType' object is not iterable
Sep 20 13:58:39 ns3031812 python[418761]: 2023-09-20 13:58:39,082 pid:418761 Thread-4359 (dispatch_action) giskard.client.giskard_client INFO     Artifact hotel_text_regression/models/497aabdc-61e6-4c27-bcfc-0c7379745ab7 already exists, skipping download
Sep 20 13:58:39 ns3031812 python[418761]: The frame.append method is deprecated and will be removed from pandas in a future version. Use pandas.concat instead.
Sep 20 13:58:39 ns3031812 python[418761]: 2023-09-20 13:58:39,373 pid:418761 Thread-4359 (dispatch_action) giskard.ml_worker.utils.logging INFO     giskard.models.model_explanation.explain_text executed in 0:00:00.270094
Sep 20 13:58:39 ns3031812 python[418761]: 2023-09-20 13:58:39,373 pid:418761 Thread-4359 (dispatch_action) giskard.ml_worker.websocket.listener WARNING  'NoneType' object is not iterable

Screenshot 2023-09-20 at 2.51.14 PM.png

[Inokinoki]

@AbSsEnT does this resolve our problem? Or should we find a better solution for the general case?

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

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