BUG: Fix Grouper with multi-level index and frequency (GH7885)
BUG: Fix mismatched logic error in compatibility check
Merge pull request #8203 from jtratner/fix_openpyxl_compat_check

BUG: Fix mismatched logic error in compatibility check
Merge branch 'Fix-GH7885' of https://github.com/jmorris0x0/pandas into jmorris0x0-Fix-GH7885
COMPAT:  dtype on windows related to GH8172