fix: band names with groups of indices

[Fersoil]

Checklist

• [X] I added a very descriptive title to this issue.
• [X] I used the GitHub search to find a similar question and didn't find it.
• [X] I am sure that this is a bug in Meteors rather than my code.
• [X] The bug is not resolved by updating to the latest stable version of Meteors.
• [X] I included a link to the documentation page I am referring to (if applicable).

Reproduction steps

band_mask, band_names = lime.get_band_mask(hsi_0, ["R", ["B", "G"]])

spectral_attributes = lime.get_spectral_attributes( hsi_0, # HSI data band_mask=band_mask, # Band mask target=1, # class analyzed - K - potassium band_names=band_names, # Band names n_samples=10, # Number of perturbation, the more the better explainer is trained but the analsys is slower )

this example fails, because the spectral attributes fails to be created

Error Message and Stack Trace (if applicable)

OS

No response

[WolodjaZ]

Already fixed