Possible fix of ATLASSQ-361 and ATLASSQ-362

• https://its.cern.ch/jira/browse/ATLASSQ-361
• https://its.cern.ch/jira/browse/ATLASSQ-362

Out of bounds access in expression 'fSumEM[i]' because 'fSumEM' is empty.

Not fully sure Cppcheck is meaningful here.