Fix check for valid type with dictionary

[wmtan]

Relval matrix test 1001 is failing with a segfault. The segfault is due to two things:

1. A missing dictionary for a class that needs a TypeWithDict constructed
2. An incorrect check in TypeWithDict for the presence of the dictionary.
   This pull request fixes the invalid check, so that test 1001 will throw a proper exception due to the missing dictionary. The missing dictionary will be added lter in a separate pull request.
   This pull request also converts many calls to abort(), used for testing purposes, to throw exceptions instead.
   Please merge promptly unless there are issues.

[cmsbuild]

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

Fix check for valid type with dictionary

It involves the following packages:

DataFormats/Provenance
FWCore/Utilities

@cmsbuild, @Degano, @Dr15Jones, @ktf, @nclopezo can you please review it and eventually sign? Thanks.
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.