xAODMetaDataCnv: Use TagInfoMgr on first event or EndInputFile Fix ATLASSIM-5368
Some information is not available in the TagInfoMgr before the first event, importantly is on BeginInputFile. Therefore, get this information into the FileMetaData after the first event is processed or EndInputFile whichever happens first. This could still lead to missing information if the first input file is empty.
Edited by Frank Berghaus