# Return true if the given string is the locator of a zero-length blob
def self.is_empty_blob_locator? locator
!!locator.to_s.match("^#{MD5_EMPTY}(\\+.*)?\$")
end
# Return true if the given string is the locator of a zero-length blob
def self.is_empty_blob_locator? locator
!!locator.to_s.match("^#{MD5_EMPTY}(\\+.*)?\$")
end