Add error messages for assert statement in dft/numint.py
Add error messages for assert statement in dft/numint.py

gkc1000/pyscf,sunqm/pyscf,gkc1000/pyscf,sunqm/pyscf,gkc1000/pyscf,sunqm/pyscf,gkc1000/pyscf,sunqm/pyscf,gkc1000/pyscf