DiskStorage destination folder check for when the destination is passed as a function. #1067
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The 'DiskStorage' function in 'storage\disk.js' will now check if the destination folder exists on the disk or not. Earlier this check was only being performed when the destination was passed as a string, not when the destination was passed as a function. Changes have also been made to throw a type error if the destination is a type other than a function or a string.