MONDRIAN: check for null to avoid null pointer in schema comparison
MONDRIAN: check for null to avoid null pointer in schema comparison

[git-p4: depot-paths = "//open/mondrian/": change = 11869]

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