Webapp crashes after cancelling and removing post from /giphy

Description

Environment: community-daily

Repro steps:
1) Send `/giphy something`
2) Click the Cancel button on the resulting post from the Giphy integration
3) Click the X button at the right side of the `Cancelled giphy: "something"` post

Observed: The web app crashes and you have to refresh
Expected: The `Cancelled giphy: "something"` post disappears

QA Test Steps

See Description

Reporter

None

Mana

2

Assignee

Michael Kochell

QA Assignee

Dylan Haussermann

Reporter

Harrison Healey

Epic Link

None

Fix versions

Mattermost Team

Integrations

Sprint

None

Labels

None

QA Testing Areas

Plugins

GitHub Issue

None

Components

None

Severity

None
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