refs #9048 Coverity bug?

https://scan6.coverity.com:8443/reports.htm#v29240/p10083/fileInstanceId=11025833&defectInstanceId=3878261&mergedDefectId=528972
not sure if Coverity just mean in this case, but have just rewritten this function to accept missing experiment info entries. Do not think its logic is tested anywhere.
Merge branch 'bugfix/9048_smallWinBugs' into develop