TST: Ensure dtypes are set correctly for empty integer columns #24386
- [x ] closes #24386
- [x ] tests added / passed
- [x ] passes `black pandas`
- [x ] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [x ] added tests to verify whether empty integer columns are loaded in as integer columns

Thanks. Can I add the test at the bottom of the `class TestDataFrameConstructors` in `tests/frame/test_constructors.py` or should I add it in a specific section of the class? thanks @avinashpancham 