Removed fatal error from CbmMCTrack if PDG code not found in TDatabasePDG. Refs #1826.

See Redmine issue 1826. In some places in simulations, non-standard PDF codes are defined and used. In such cases, CbmMCTrack cannot get mass and charge from TDatabasePDG. In the respective accessors, a fatal error was thrown, which is inconvenient. It is replaced by a LOG(error) in this MR.

changed milestone to %APR21

added Simulation label

approved this merge request

Dear @f.uhlig, @v.friese, @p.-a.loizeau,

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added CodeOwners label

merged