changed compareValues so that a null value is considered low (-infinity, according to MSOLAP)
changed compareValues so that a null value is considered low (-infinity, according to MSOLAP)

[git-p4: depot-paths = "//open/mondrian/": change = 473]

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