Allow inheritance check for non-class types

[wmtan]

The TypeWithDict class (our replacement for Reflex::Type) has checks to see if one type inherits from another type. Currently, these checks will throw an exception if one or both of the types in question is not a class. The check should be more general. This pull request changes the check for inheritance to simply return false if one or both of the types is not a class.
Please merge promptly unless there are issues.

[cmsbuild]

A new Pull Request was created by @wmtan for CMSSW_7_2_ROOT6_X.

Allow inheritance check for non-class types

It involves the following packages:

FWCore/Utilities

@cmsbuild, @Degano, @Dr15Jones, @ktf, @nclopezo can you please review it and eventually sign? Thanks.
@wddgit this is something you requested to watch as well.
You can sign-off by replying to this message having '+1' in the first line of your reply.
You can reject by replying to this message having '-1' in the first line of your reply.