MONDRIAN: fix periodsToDate, so that level lower than member's level will not crash
MONDRIAN: fix periodsToDate, so that level lower than member's level will not crash

[git-p4: depot-paths = "//open/mondrian/": change = 1565]

wetet2/mondrian,julianhyde/mondrian,preisanalytics/mondrian,openedbox/mondrian,Seiferxx/mondrian,OSBI/mondrian,mdamour1976/mondrian,cocosli/mondrian,OSBI/mondrian,sayanh/mondrian,rfellows/mondrian,AvinashPD/mondrian,mustangore/mondrian,mdamour1976/mondrian,bmorrise/mondrian,nextelBIS/mondrian,cesarmarinhorj/mondrian,ivanpogodin/mondrian,lgrill-pentaho/mondrian,truvenganong/mondrian,citycloud-bigdata/mondrian,pentaho/mondrian,Seiferxx/mondrian,ivanpogodin/mondrian,citycloud-bigdata/mondrian,openedbox/mondrian,stiberger/mondrian,Seiferxx/mondrian,bmorrise/mondrian,sayanh/mondrian,AvinashPD/mondrian,mdamour1976/mondrian,lgrill-pentaho/mondrian,openedbox/mondrian,pedrofvteixeira/mondrian,rfellows/mondrian,pentaho/mondrian,sayanh/mondrian,dkincade/mondrian,stiberger/mondrian,citycloud-bigdata/mondrian,mustangore/mondrian,cesarmarinhorj/mondrian,wetet2/mondrian,wetet2/mondrian,pedrofvteixeira/mondrian,julianhyde/mondrian,cesarmarinhorj/mondrian,stiberger/mondrian,truvenganong/mondrian,dkincade/mondrian,lgrill-pentaho/mondrian,pedrofvteixeira/mondrian,preisanalytics/mondrian,dkincade/mondrian,bmorrise/mondrian,truvenganong/mondrian,preisanalytics/mondrian,cocosli/mondrian,syncron/mondrian,ivanpogodin/mondrian,AvinashPD/mondrian,syncron/mondrian,mustangore/mondrian,nextelBIS/mondrian,pentaho/mondrian,nextelBIS/mondrian,cocosli/mondrian,OSBI/mondrian,syncron/mondrian