fix: bug when fit_intercept=False, support.size=0

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (5c62b52) 97.74% compared to head (5130593) 97.74%. Report is 4 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #520 +/- ## ======================================= Coverage 97.74% 97.74% ======================================= Files 7 7 Lines 977 977 ======================================= Hits 955 955 Misses 22 22 ``` | [Flag](https://app.codecov.io/gh/abess-team/abess/pull/520/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=abess-team) | Coverage Δ | | |---|---|---| | [Python](https://app.codecov.io/gh/abess-team/abess/pull/520/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=abess-team) | `97.74% <100.00%> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=abess-team#carryforward-flags-in-the-pull-request-comment) to find out more. | [Files Changed](https://app.codecov.io/gh/abess-team/abess/pull/520?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=abess-team) | Coverage Δ | | |---|---|---| | [python/abess/datasets.py](https://app.codecov.io/gh/abess-team/abess/pull/520?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=abess-team#diff-cHl0aG9uL2FiZXNzL2RhdGFzZXRzLnB5) | `100.00% <100.00%> (ø)` | |

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