Fix guard clause in RevisionScoreImporter
Fix guard clause in RevisionScoreImporter

The recently introduced previous version was causing every wp10_previous score to get skipped.

ragesoss/WikiEduDashboard,WikiEducationFoundation/WikiEduDashboard,adamwight/WikiEduDashboard,WikiEducationFoundation/WikiEduDashboard,feelfreelinux/WikiEduDashboard,alpha721/WikiEduDashboard,KarmaHater/WikiEduDashboard,alpha721/WikiEduDashboard,majakomel/WikiEduDashboard,ragesoss/WikiEduDashboard,MusikAnimal/WikiEduDashboard,WikiEducationFoundation/WikiEduDashboard,feelfreelinux/WikiEduDashboard,majakomel/WikiEduDashboard,Wowu/WikiEduDashboard,adamwight/WikiEduDashboard,Wowu/WikiEduDashboard,feelfreelinux/WikiEduDashboard,sejalkhatri/WikiEduDashboard,MusikAnimal/WikiEduDashboard,WinnySilva/WikiEduDashboard,MusikAnimal/WikiEduDashboard,WinnySilva/WikiEduDashboard,ragesoss/WikiEduDashboard,majakomel/WikiEduDashboard,Wowu/WikiEduDashboard,alpha721/WikiEduDashboard,KarmaHater/WikiEduDashboard,WikiEducationFoundation/WikiEduDashboard,sejalkhatri/WikiEduDashboard,adamwight/WikiEduDashboard,WikiEducationFoundation/WikiEduDashboard,Wowu/WikiEduDashboard,sejalkhatri/WikiEduDashboard,sejalkhatri/WikiEduDashboard,KarmaHater/WikiEduDashboard,MusikAnimal/WikiEduDashboard,WinnySilva/WikiEduDashboard,KarmaHater/WikiEduDashboard,sejalkhatri/WikiEduDashboard,majakomel/WikiEduDashboard,feelfreelinux/WikiEduDashboard,alpha721/WikiEduDashboard