Always print warning message about min_package

**Describe the bug**
/opt/monai/monai/utils/module.py:100: UserWarning: <module 'pkg_resources' from '/opt/conda/lib/python3.8/site-packages/pkg_resources/__init__.py'> has no attribute __version__ in min_version check.
  warnings.warn(f"{the_module} has no attribute __version__ in min_version check.")
