Fix: Prevent error in Whiteboard when adding a Deckboard

[silverkszlo]

• Resolves: https://support.nextcloud.com/#ticket/zoom/85996
• Target version: main

Summary

Problem

Embedding a Deck board (Vue + Vue Router) inside the Whiteboard app (React) caused a runtime error. The Deck component attempted to access this.$route.params.cardId during initialization — but when running inside Whiteboard, there’s no Vue Router context, so this.$route was undefined, triggering:
TypeError: can't access property "params", this.$route is undefined

Root Cause

In Board.vue, the fetchData() method runs in the created() hook and directly references this.$route.params.cardId. This works in the full Deck app but fails when embedded.

Solution

Added optional chaining to safely access route data:
const routeCardId = this.$route?.params?.cardId ? parseInt(this.$route.params.cardId) : null

• In Deck (with router): normal behavior, card ID loads from URL
• In Whiteboard (no router): returns null, preventing the error

TODO

• ...

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Documentation (manuals or wiki) has been updated or is not required

[grnd-alt]

/backport to stable29

[grnd-alt]

/backport to stable30

[grnd-alt]

/backport to stable31

[grnd-alt]

/backport to stable32