While building auto-generated documentation for gled classes i came
across an error in ClassDef specification in a nested class which,
coupled with gled's documentation building script, resulted in feeding
THtml a class-name list with entries that were not present in the
dictionary. Thus root crashed ...
I've attached a patch with added protections against such cases. I'm not
exactly sure if it's the right way to do it ... perhaps an error and an
immediate exit from the processing loop would be more appropriate.


git-svn-id: http://root.cern.ch/svn/root/trunk@10892 27541ba8-7e3a-0410-8455-c3a389f83636