refs #9084 Did the same as in the previous commit with ConvToMDHistoWS
refs #9048 Coverity noise

https://scan6.coverity.com:8443/reports.htm#v29240/p10083/fileInstanceId=11025006&defectInstanceId=3877350&mergedDefectId=529173
uninitialized members in ConvToMDBase.cpp constructor.
Merge branch 'bugfix/9048_smallWinBugs' into develop