MONDRIAN: Makes HierarchyAccessImpl.topLevel and HierarchyAccessImpl.bottomLevel never null.
MONDRIAN: Makes HierarchyAccessImpl.topLevel and HierarchyAccessImpl.bottomLevel never null.

[git-p4: depot-paths = "//open/mondrian/": change = 14551]

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