Fix: the problem of a column including nans in test but training set

[anhkhoangoho]

fix: test set has a column including nans, but this column does not c…

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (3c50162) 82.59% compared to head (5889caf) 82.58%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #110 +/- ## ========================================== - Coverage 82.59% 82.58% -0.01% ========================================== Files 20 20 Lines 2700 2699 -1 Branches 338 338 ========================================== - Hits 2230 2229 -1 Misses 390 390 Partials 80 80 ``` | [Files](https://app.codecov.io/gh/Quantmetry/qolmat/pull/110?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Quantmetry) | Coverage Δ | | |---|---|---| | [qolmat/imputations/imputers.py](https://app.codecov.io/gh/Quantmetry/qolmat/pull/110?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Quantmetry#diff-cW9sbWF0L2ltcHV0YXRpb25zL2ltcHV0ZXJzLnB5) | `93.23% <100.00%> (-0.02%)` | :arrow_down: |

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