Allow zero-argument rx `or' and `seq' forms
Make the rx `or' and `seq' forms accept zero arguments to produce a never-matching regexp and an empty string, respectively. * lisp/emacs-lisp/rx.el: Require cl-extra. (rx-constituents, rx-or): Permit zero args. (rx): Amend doc string for `or' and `seq'. * test/lisp/emacs-lisp/rx-tests.el (rx-or, rx-seq): Test the change. * etc/NEWS (Changes in Specialized Modes and Packages): Mention the change.
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