Another minor safety check - when setting default coreelectrons after parsing.
Another minor safety check - when setting default coreelectrons after parsing.

berquist/cclib,langner/cclib,berquist/cclib,ben-albrecht/cclib,berquist/cclib,ghutchis/cclib,ben-albrecht/cclib,ghutchis/cclib,cclib/cclib,Clyde-fare/cclib,andersx/cclib,andersx/cclib,jchodera/cclib,cclib/cclib,langner/cclib,Clyde-fare/cclib,jchodera/cclib,gaursagar/cclib,ATenderholt/cclib,Schamnad/cclib,cclib/cclib,gaursagar/cclib,langner/cclib,Schamnad/cclib,ATenderholt/cclib