Cy Schubert a7399ea2dd telnet: Fix telnet segfault when invalid set or help help commands
Silently ignore invalid set ' ' and invalid help help commands.
This is the same fix applied by NetBSD in hg commit 1019940:4f248823eaff.

PR:		265097
Reported by:	Simon Josefsson <simon@josefsson.org>
Obtained from:	NetBSD hg commit 1019940:4f248823eaff
		NetBSD PR/56918
MFC after:	1 week
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