openssl cms: add error message if operation option is missing
If the `openssl cms` command is called without specifying an
operation option, it replies with the following laconic error message:
cms: Use -help for summary.
This commit adds a helpful error message:
No operation option (-encrypt|-decrypt|-sign|-verify|...) specified.
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/8861)
(cherry picked from commit
42151b8edb112d23d81f6e0d6606d98797771b4b)