dst-maker crashes on corrupted LCIO input files.

[mholtrop]

While one may not expect the dst-maker to properly continue on a corrupt LCIO file, it may be desirable to only put out a warning of the corruption and then continue.

Specifically, a file was encountered that had:

• OtherElectron particles with an invalid track index of [0000000]
• UnconstrainedVcCandidate particles with invalid daughter particles.
• UnconstrainedVcCandidate particles with invalid ecal clusters.

A test is added to detect these conditions. If encountered, the corresponding track, daughter or cluster is skipped and a warning is printed.