Address code issues raised by qlty

[fepegar]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 25.00000% with 33 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/torchio/utils.py	13.51%	32 Missing ⚠️
src/torchio/datasets/ixi.py	85.71%	1 Missing ⚠️

Files with missing lines	Coverage Δ
src/torchio/datasets/ixi.py	43.36% <85.71%> (ø)
src/torchio/utils.py	77.65% <13.51%> (-0.78%)	⬇️

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