fix: missing values in fmt_number

[jrycw]

Fix #314.

At first, I attempted to address this issue by utilizing the check from fmt_scientific to verify x:

if is_na(self._tbl_data, x):
    return x

However, this caused a failure in tests/test_export.py::test_html_string_generated. Consequently, I opted to directly check whether x is None or not.

from great_tables import GT, exibble
import polars as pl

exibble_pl = pl.from_pandas(exibble)

GT(exibble_pl).fmt_number(columns="num")

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.46%. Comparing base (38033ce) to head (640ab52).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #317   +/-   ##
=======================================
  Coverage   82.45%   82.46%           
=======================================
  Files          41       41           
  Lines        4258     4260    +2     
=======================================
+ Hits         3511     3513    +2     
  Misses        747      747           

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[machow]

shoot... thanks for looking into this. I looked at a diff of the snapshot, and it seems okay to use the same is_na() guard is this function, since it's behavior will match the others. Hope it's okay, I just added to this PR!

[rich-iannone]

LGTM!

[rich-iannone]

Thank you @jrycw !