Handle incorrect attribute names a bit better.
Handle incorrect attribute names a bit better.

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