[MM-47810] Return error from rolesMemberCmdF

[ermanimer]

Return error from rolesMemberCmdF

I applied the same approach with rolesSystemAdminCmd function.

Ticket: mattermost/mattermost#21476

JIRA Issue: https://mattermost.atlassian.net/browse/MM-47810

[mattermod]

Hello @ermanimer,

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[ermanimer]

/check-cla

[isacikgoz]

LGTM, thanks @ermanimer 🎉

[ermanimer]

Thank you @isacikgoz 😄

[noxer]

Thank you very much for your contribution @ermanimer. Looks good to me.

[ermanimer]

Thank you @noxer 😄