fix multiple subscribe/unsubscribe for subscriptions with more than one event handlers
fix multiple subscribe/unsubscribe for subscriptions with more than one event handlers

fateevv/basisjs,basisjs/basisjs,istrel/basisjs,tyanas/basisjs,fateevv/basisjs,tyanas/basisjs,smelukov/basisjs,istrel/basisjs,basisjs/basisjs,smelukov/basisjs,basisjs/basisjs,tyanas/basisjs,smelukov/basisjs,fateevv/basisjs,istrel/basisjs