Protect against invalide TSOS

[jhgoh]

This PR is to solve a crash during the muon reconstruction.
https://hypernews.cern.ch/HyperNews/CMS/get/recoDevelopment/1477.html

Trajectory state after a propagation was invalid but the validity haven't been checked and fed into the next step of the propagation, caused crash.
We use the TSOS of the previous step if the propagation failed.

Changes are expected only for the problematic cases, so there should no difference in normal cases.

[cmsbuild]

A new Pull Request was created by @jhgoh (Junghwan John Goh) for CMSSW_8_1_X.

It involves the following packages:

RecoMuon/GlobalTrackingTools

@cmsbuild, @cvuosalo, @slava77, @davidlange6 can you please review it and eventually sign? Thanks.
@bellan, @abbiendi, @calderona, @HuguesBrun, @battibass, @trocino, @amagitte, @bachtis, @rociovilar this is something you requested to watch as well.
@slava77, @smuzaffar you are the release manager for this.

cms-bot commands are list here #13028

[slava77]

@cmsbuild please test

[cmsbuild]

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/15242/console

[cmsbuild]

+1
Tested at: 4441991
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-15891/15242/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-15891/15242/summary.html

[slava77]

+1

for #15891 4441991

• changes are in line with the description, affecting only events that would otherwise have a crash in processing
• jenkins tests pass and comparisons with baseline show no differences

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_8_1_X IBs (tests are also fine). This pull request requires discussion in the ORP meeting before it's merged. @slava77, @davidlange6, @smuzaffar