COMMAND DOCS avoid adding summary/since if they don't exist #10252
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If summary or since is empty, we used to return NULL in
COMMAND DOCS. Currently all redis commands will have these
two fields.
But not for module command, summary and since are optional
for RM_SetCommandInfo. With the change in #10043, if a module
command doesn't have the summary or since, redis-cli will
crash (see #10250).
In this commit, COMMAND DOCS avoid adding summary or since
when they are missing.