basis.data.dataset: remove wrong warning in Merge#setSources
basis.data.dataset: remove wrong warning in Merge#setSources

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