add missing Pythia8 Main31 lines
Description of bug
some Pythia8 Main31 lines missing
Changes introduced
added missing Pythia8 Main31 lines
Tests
Issues resolved
needed for ATLMCPROD-8912
Closes #
some Pythia8 Main31 lines missing
added missing Pythia8 Main31 lines
needed for ATLMCPROD-8912
Closes #