add pflow fjvt to EXOT5, patch pflow fjvt and fjvt variables for data without a primary vertex
- add pflow fjvt to EXOT5
- patch pflow fjvt and fjvt variables for data without a primary vertex
- move error messages that are not real errors to warning or debug depending on importance
This is a result of many crashes in the data production here: https://its.cern.ch/jira/browse/ATLASDPD-1398