/incident end when incident already closed reports unexpected message

Description

Running /incident end within a channel associated with a closed incident displays an error about not being associated with an incident, instead of the incident already being closed:

QA Test Steps

No testing required.

Mana

None

Assignee

Christopher Poile

QA Assignee

None

Reporter

Jesse Hallam

Epic Link

None

Fix versions

Mattermost Team

Workflows

Sprint

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QA Testing Areas

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GitHub Issue

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Components

Severity

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