Fix for [PSW-177]. Adds a proper message when the file is either empty or invalid.
Fix for [PSW-177]. Adds a proper message when the file is either empty or invalid.

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