Fix bug in ecp parser when the ecp data are not found
Fix bug in ecp parser when the ecp data are not found

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