From: Antonio Borneo <borneo.antonio@gmail.com>
Date: Sat, 30 Mar 2019 10:19:47 +0000 (+0100)
Subject: helper/command: handle empty "usage" with add_help_text/add_usage_text
X-Git-Tag: v0.11.0-rc1~747
X-Git-Url: https://review.openocd.org/gitweb?p=openocd.git;a=commitdiff_plain;h=c19de41a0f49ee11eb474c51dc243383047bd663;hp=c19de41a0f49ee11eb474c51dc243383047bd663

helper/command: handle empty "usage" with add_help_text/add_usage_text

By using the command "add_help_text" to add a help text to a TCL
procedure it implicitly creates a new command_registration struct
that has field .usage set to NULL. This triggers a debug message
	BUG: command '%s' does not have the '.usage' field filled out

Use an empty string if usage field is NULL.

Plus, do not annoy the user with a LOG_INFO when the command
"add_usage_text" replaces an empty usage.

Change-Id: I4a72646e0fb704ba354f938d774055540cde3967
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: http://openocd.zylin.com/5025
Tested-by: jenkins
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>
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