Do not migrate garbage reviews
Do not migrate garbage reviews

i.e. ones referencing invalid tracks/abstracts

DirkHoffmann/indico,OmeGak/indico,ThiefMaster/indico,mic4ael/indico,pferreir/indico,mic4ael/indico,ThiefMaster/indico,mvidalgarcia/indico,DirkHoffmann/indico,pferreir/indico,DirkHoffmann/indico,mic4ael/indico,pferreir/indico,mvidalgarcia/indico,mvidalgarcia/indico,OmeGak/indico,OmeGak/indico,indico/indico,ThiefMaster/indico,indico/indico,pferreir/indico,DirkHoffmann/indico,indico/indico,mic4ael/indico,mvidalgarcia/indico,indico/indico,ThiefMaster/indico,OmeGak/indico