[FIX] Allow MultiNiftiMasker to use generate_report method

[ymzayek]

• Fixes bug reported in [BUG/ENH] Improve generate_report method of multi-subject maskers #3960
• Relates to [MAINT] Store 1 timepoint for 4D generating a report with the maskers #3935

Changes proposed in this pull request:

• Allow MultiNiftiMasker to use generate_report for one subject for now (mimicking multi labels and maps masker behavior)

[github-actions]

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[codecov]

Codecov Report

Merging #4001 (0cb4ee6) into main (b3385c5) will increase coverage by 0.02%.
Report is 1 commits behind head on main.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #4001      +/-   ##
==========================================
+ Coverage   91.73%   91.75%   +0.02%     
==========================================
  Files         145      145              
  Lines       16230    16222       -8     
  Branches     3367     3370       +3     
==========================================
- Hits        14888    14884       -4     
+ Misses        797      795       -2     
+ Partials      545      543       -2     

Flag	Coverage Δ
macos-latest_3.10	91.67% <100.00%> (?)
macos-latest_3.11	91.67% <100.00%> (+0.02%)	⬆️
macos-latest_3.12	91.67% <100.00%> (?)
macos-latest_3.8	91.63% <100.00%> (+0.02%)	⬆️
macos-latest_3.9	91.63% <100.00%> (+0.02%)	⬆️
ubuntu-latest_3.10	91.67% <100.00%> (+0.02%)	⬆️
ubuntu-latest_3.11	91.67% <100.00%> (+0.02%)	⬆️
ubuntu-latest_3.12	91.67% <100.00%> (?)
ubuntu-latest_3.8	91.63% <100.00%> (+0.02%)	⬆️
ubuntu-latest_3.9	91.63% <100.00%> (+0.02%)	⬆️
windows-latest_3.10	91.61% <100.00%> (+0.02%)	⬆️
windows-latest_3.11	91.61% <100.00%> (+0.02%)	⬆️
windows-latest_3.12	91.61% <100.00%> (?)
windows-latest_3.8	91.57% <100.00%> (+0.02%)	⬆️
windows-latest_3.9	91.58% <100.00%> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
nilearn/maskers/multi_nifti_masker.py	95.00% <100.00%> (+1.81%)	⬆️

... and 1 file with indirect coverage changes

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[bthirion]

LGTM ! Just beware the failure.

[bthirion]

Just needs a bit more coverage. Looks good otherwise.

[bthirion]

CodeCov still complains about two untested lines. Is it wrong ?
The PR LGTM otherwise.

[Remi-Gau]

Made 2 small suggestions that should take care of the coverage by making the else the default. As far as I can tell this should not affect behavior: @ymzayek am I correct?

[ymzayek]

@Remi-Gau yes that works. Not really sure about the codecov report but anyways it should be good now. Well let's see

[ymzayek]

This one should be good to go. Any last comments?

[Remi-Gau]

This one should be good to go. Any last comments?

go for it