Return an empty array for notes when a PDF bundle does not contain a .skim file, because that indicates the file does not have notes, which is not an error.
Return an empty array for notes when a PDF bundle does not contain a .skim file, because that indicates the file does not have notes, which is not an error.

JackieXie168/skim,JackieXie168/skim,JackieXie168/skim,JackieXie168/skim,JackieXie168/skim