Fix empty collection issue during schema sync
Fix empty collection issue during schema sync

With some adapters, things will break if you try to run `.createEach()` with
an empty list.

luislobo/waterline,postmanlabs/sails-mysql-transactions-waterline,jonniedeb/waterline,jianpingw/waterline,mmiller42/waterline,Atlantis-Software/waterline,balderdashy/waterline,waterlinejs/waterline,particlebanana/waterline,tjwebb/waterline,nbiton/waterline,moklick/waterline,marnusw/waterline,dmarcelino/waterline,ctartist621/waterline,AlexisNo/waterline,atiertant/offshore,hippich/waterline,scippio/waterline,eskygo/waterline,contra/waterline,Zaggen/waterline,antoniopol06/waterline,devinivy/waterline,mcanthony/waterline,listepo/waterline,Atlantis-Software/offshore,3032441712/waterline,kriswill/waterline,citizenken/waterline,metidia/waterline