Assumptions: is_zero: add XFAIL test for issue #7993
fix Mul._eval_is_rational
Merge pull request #1 from smichr/rat

fix Mul._eval_is_rational
Assumptions: 7993 test use is not "=="
Merge pull request #8382 from cbm755/7993_xfail_test

Assumptions: is_zero: add XFAIL test for issue #7993