Fix tests run on enron

[Hartorn]

Description

TextNumberToWordTransformation was failing if row["language__gsk__meta"] was nan

Before : https://github.com/Giskard-AI/giskard/actions/runs/7750039265
After : https://github.com/Giskard-AI/giskard/actions/runs/7753720227

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.

[rabah-khalek]

if not pd.isna(value) and pd.isna(lang) I would still apply num2words without specifying lang (it would default to english).

[Hartorn]

I changed the defaulting to en

[sonarcloud]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
83.3% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud